The Giant's Causeway, Ireland

The Giant's Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic eruption. It is located in County Antrim on the northeast coast of Northern Ireland, about three miles (4.8 km) northeast of the town of Bushmills. It was declared a World Heritage Site by UNESCO in 1986, and a National Nature Reserve in 1987 by the Department of the Environment for Northern Ireland. In a 2005 poll of Radio Times readers, the Giant's Causeway was named as the fourth greatest natural wonder in the United Kingdom. The tops of the columns form stepping stones that lead from the cliff foot and disappear under the sea. Most of the columns are hexagonal, although there are also some with four, five, seven or eight sides. The tallest are about 12 metres (39 ft) high, and the solidified lava in the cliffs is 28 metres thick in places. The Giant's Causeway is today owned and managed by the National Trust and it is the most popular tourist attraction in Northern Ireland.

[caption id="attachment_535" align="aligncenter" width="1277"] The Giant's Causeway[/caption]

Some 50 to 60 million years ago, during the Paleogene period, Antrim was subject to intense volcanic activity, when highly fluid molten basalt intruded through chalk beds to form an extensive lava plateau. As the lava cooled rapidly, contraction occurred. Horizontal contraction fractured in a similar way to drying mud, with the cracks propagating down as the mass cooled, leaving pillarlike structures, which are also fractured horizontally into "biscuits". In many cases the horizontal fracture has resulted in a bottom face that is convex while the upper face of the lower segment is concave, producing what are called "ball and socket" joints. The size of the columns is primarily determined by the speed at which lava from a volcanic eruption cools. The extensive fracture network produced the distinctive columns seen today. The basalts were originally part of a great volcanic plateau called the Thulean Plateau which formed during the Paleogene period.

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According to legend, the columns are the remains of a causeway built by a giant. The story goes that the Irish giant Fionn mac Cumhaill (Finn MacCool) was challenged to a fight by the Scottish giant Benandonner. Fionn accepted the challenge and built the causeway across the North Channel so that the two giants could meet. In one version of the story, Fionn defeats Benandonner. In another, Fionn hides from Benandonner when he realises that his foe is much bigger than him. Fionn's wife, Úna, disguises Fionn as a baby and tucks him in a cradle. When Benandonner sees the size of the 'baby', he reckons that its father, Fionn, must be a giant among giants. He flees back to Scotland in fright, destroying the causeway behind him so that Fionn could not follow. Across the sea, there are identical basalt columns (a part of the same ancient lava flow) at Fingal's Cave on the Scottish isle of Staffa, and it is possible that the story was influenced by this.

In Irish mythology, Fionn mac Cumhaill is not a giant but a hero with supernatural abilities. In Fairy and Folk Tales of the Irish Peasantry (1888) it is noted that, over time, "the pagan gods of Ireland grew smaller and smaller in the popular imagination, until they turned into the fairies; the pagan heroes grew bigger and bigger, until they turned into the giants". There are no surviving pre-Christian stories about the Giant's Causeway. However, it may have originally been associated with the Fomorians (Fomhóraigh); the Irish name Clochán na bhFomhóraigh or Clochán na bhFomhórach means "stepping stones of the Fomhóraigh". The Fomhóraigh are a race of supernatural beings in Irish mythology who were sometimes described as giants and who may have originally been part of a pre-Christian pantheon.

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Cappadocia, Turkey

Cappadocia is a historical region in Central Anatolia, largely in Nevsehir Province, in Turkey. In the time of Herodotus, the Cappadocians were reported as occupying the whole region from Mount Taurus to the vicinity of the Euxine (Black Sea). Cappadocia, in this sense, was bounded in the south by the chain of the Taurus Mountains that separate it from Cilicia, to the east by the upper Euphrates and the Armenian Highland, to the north by Pontus, and to the west by Lycaonia and eastern Galatia.

[caption id="attachment_531" align="aligncenter" width="1600"] Cappadocia, Turkey[/caption]

The name (Cappadocia) was traditionally used in Christian sources throughout history and is still widely used as an international tourism concept to define a region of exceptional natural wonders, in particular characterized by fairy chimneys and a unique historical and cultural heritage.

Cappadocia is a popular tourist destination, as it has many areas with unique geological, historic, and cultural features. The region is located southwest of the major city Kayseri, which has airline and railway service to Ankara and Istanbul. The most important towns and destinations in Cappadocia are Urgup, Goreme, Ihlara Valley, Selime, Guzelyurt, Uchisar, Avanos and Zelve. Among the underground cities worth seeing are Derinkuyu, Kaymakli, Gaziemir and Ozkanak. The best historic mansions and cave houses for tourist stays are in Urgup, Goreme, Guzelyurt and Uchisar.

Hot-air ballooning is very popular in Cappadocia and is available in Goreme. Trekking is enjoyed in Ihlara Valley, Monastery Valley (Guzelyurt), Urgup and Goreme. Sedimentary rocks formed in lakes and streams and ignimbrite deposits that erupted from ancient volcanoes approximately 9 to 3 million years ago, during the late Miocene to Pliocene epochs, underlie the Cappadocia region. The rocks of Cappadocia near Göreme eroded into hundreds of spectacular pillars and minaret-like forms. People of the villages at the heart of the Cappadocia Region carved out houses, churches and monasteries from the soft rocks of volcanic deposits. Göreme became a monastic centre in 300—1200 AD.

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The first period of settlement in Göreme goes back to the Roman period. The Yusuf Koç, Ortahane, Durmus Kadir and Bezirhane churches in Göreme, and houses and churches carved into rocks in the Uzundere, Bağıldere and Zemi Valleys all illustrate history and can be seen today. The Göreme Open Air Museum is the most visited site of the monastic communities in Cappadocia (see Churches of Göreme, Turkey) and is one of the most famous sites in central Turkey. The complex contains more than 30 carved-from-rock churches and chapels, some having superb frescoes inside, dating from the 9th century to the 11th century.

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Libyan Desert (Waw an Namus), Libya

Waw an Namus (Caldera of Mosquitoes) is a volcanic field, cone and caldera in the southern Fezzan region of southern Libya. It is in the near-geographic center of the Sahara Desert.

The inside of the caldera houses an oasis of rich foliage and three small salt lakes of variable color which are the reason for the volcano's name. A volcanic field of dark basaltic tephra flow extends 10–20 kilometres (6.2–12 mi) around the caldera. The dark field's vast size allows it to be easily seen from space.

[caption id="attachment_526" align="aligncenter" width="1944"] Waw an Namus[/caption]

The Libyan Desert, which covers much of Libya, is one of the most arid places on earth. In places, decades may pass without rain, and even in the highlands rainfall seldom happens, once every 5–10 years. At Uweinat, as of 2006 the last recorded rainfall was in September 1998. There is a large depression, the Qattara Depression, just to the south of the northernmost scarp, with Siwa Oasis at its western extremity. The depression continues in a shallower form west, to the oases of Jaghbub and Jalu.

Likewise, the temperature in the Libyan desert can be extreme; on 13 September 1922 the town of 'Aziziya, which is located southwest of Tripoli, recorded an air temperature of 57.8 °C (136.0 °F), considered to be a world record. In September 2012, however, the world record figure of 57.8°C was overturned by the World Meteorological Organization.

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There are a few scattered uninhabited small oases, usually linked to the major depressions, where water can be found by digging to a few feet in depth. In the west there is a widely dispersed group of oases in unconnected shallow depressions, the Kufra group, consisting of Tazerbo, Rebianae and Kufra. Aside from the scarps, the general flatness is only interrupted by a series of plateaus and massifs near the centre of the Libyan Desert, around the convergence of the Egyptian-Sudanese-Libyan borders.

Slightly further to the south are the massifs of Arkenu, Uweinat and Kissu. These granite mountains are ancient, having formed long before the sandstones surrounding them. Arkenu and Western Uweinat are ring complexes very similar to those in the Aïr Mountains. Eastern Uweinat (the highest point in the Libyan Desert) is a raised sandstone plateau adjacent to the granite part further west. The plain to the north of Uweinat is dotted with eroded volcanic features. With the discovery of oil in the 1950s also came the discovery of a massive aquifer underneath much of the country. The water in this aquifer pre-dates the last ice ages and the Sahara desert itself. This area also contains the Arkenu structures, which have been hypothesized to be double impact craters.

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Namaqualand, Namibia

Namaqualand is an arid region of Namibia and South Africa, extending along the west coast over 600 miles (970 km) and covering a total area of 170,000 square miles/440,000 km². It is divided by the lower course of the Orange River into two portions - Little Namaqualand to the south and Great Namaqualand to the north. Little Namaqualand is within the Namakwa District Municipality and forms part of Northern Cape Province, South Africa. A typical municipality is Kamiesberg Local Municipality. Great Namaqualand is in the Karas Region of Namibia. Great Namaqualand is sparsely populated by the Namaqua, a Khoikhoi people who traditionally inhabited the Namaqualand region.

[caption id="attachment_519" align="aligncenter" width="3872"] Namaqualand[/caption]

Some of the more prominent towns in this area are Springbok, being the capital of this region, as well as Kleinzee and Koiingnaas, both private mining towns owned by De Beers Diamond Mines. This area is quite rich in alluvial diamonds deposited along the coast by the Orange River. Oranjemund is another mining town along this coast, situated in Namibia but very much on the border. As the name suggests, it is at the mouth of the Orange River which forms the border between South Africa and Namibia. The town of Alexander Bay is located 3 miles (5 km) away opposite the river on the South African side and is linked to Oranjemund by the Ernest Oppenheimer Bridge. Other links crossing the river further upstream are a re-introduced pontoon at Sendelingsdrift in the Richtersveld National Park, and road bridges at Vioolsdrif (the main border crossing between the two countries) and at the remote border crossing of Onseepkans.
There is a vibrant fishing industry along this stretch of the South African west coast. Especially in Port Nolloth, the major resort town of Namaqualand, and Hondeklipbaai, or Dogstonebay. Called such because of a large boulder outside the town which, when viewed correctly looks vaguely like a dog sitting down. Since the 19th century copper has been mined at Springbok and its surrounding towns, while a large mine extracting copper, lead, zinc and silver is located at Aggeneys, 70 miles (113 km) further inland.

Namaqualand is quite popular with both local and international tourists during early springtime, when for a short period this normally arid area becomes covered with a kaleidoscope of colour during the flowering season. This is known throughout South Africa as the Namaqualand daisy season, when orange and white daisies, as well as hundreds of other flowering species, spring up from a previously barren landscape. A part of Little Namaqualand, known as the Richtersveld, is a national park and a World Heritage Site, while the often-visited Namaqua National Park and the Goegap Nature Reserve are located short distances from Kamieskroon and Springbok respectively.As a region it has one of the highest percentages of Afrikaans speakers in the world, with over 95% of the population speaking the Afrikaans Language. The original Khoekhoe language of the Nama people, with its intricate system of click sounds, also still survives in remote areas.

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Racetrack Playa, United States

The Racetrack Playa, or The Racetrack, is a scenic dry lake feature with "sailing stones" that leave linear "racetrack" imprints. It is located above the northwestern side of Death Valley, in Death Valley National Park.

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