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.

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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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Pamukkale, Turkey

Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli Province in southwestern Turkey. The city contains hot springs and travertines, terraces of carbonate minerals left by the flowing water. It is located in Turkey's Inner Aegean region, in the River Menderes valley, which has a temperate climate for most of the year.

The ancient Greco-Roman and Byzantine city of Hierapolis was built on top of the white "castle" which is in total about 2,700 metres (8,860 ft) long, 600 m (1,970 ft) wide and 160 m (525 ft) high. It can be seen from the hills on the opposite side of the valley in the town of Denizli, 20 km away. Tourism is and has been a major industry. People have bathed in its pools for thousands of years. As recently as the mid-20th century, hotels were built over the ruins of Heropolis, causing considerable damage. An approach road was built from the valley over the terraces, and motor bikes were allowed to go up and down the slopes. When the area was declared a World Heritage Site, the hotels were demolished and the road removed and replaced with artificial pools. Wearing shoes in the water is prohibited to protect the deposits.

Pamukkale's terraces are made of travertine, a sedimentary rock deposited by water from the hot springs. In this area, there are 17 hot water springs in which the temperature ranges from 35 °C (95 °F) to 100 °C (212 °F). The water that emerges from the spring is transported 320 metres (1,050 ft) to the head of the travertine terraces and deposits calcium carbonate on a section 60 to 70 metres (200 to 230 ft) long covering an expanse of 240 metres (790 ft) to 300 metres (980 ft). When the water, supersaturated with calcium carbonate, reaches the surface, carbon dioxide degasses from it, and calcium carbonate is deposited. The depositing continues until the carbon dioxide in the water balances the carbon dioxide in the air. Calcium carbonate is deposited by the water as a soft jelly, but this eventually hardens into travertine.

This reaction is affected by the weather conditions, ambient temperature, and the flow duration. Precipitation continues until the carbon dioxide in the thermal water reaches equilibrium with the carbon dioxide in the atmosphere. Measurements made at the source of the springs find atmospheric levels of 725 mg/l carbon dioxide, by the time this water flows across the travertines, this figure falls to 145 mg/l. Likewise calcium carbonate falls from 1200 mg/l to 400 mg/l and calcium 576.8 mg/l to 376.6 mg/l. From these results it is calculated that 499.9 mg of CaCO3 is deposited on the travertine for every liter of water. This means that for a flow rate of 1 ı/s of water 43191 grams are deposited daily. The average density of a travertine is 1.48 g/cm3 implying a deposit of 29.2 dm3. Given that the average flow of the water is 465.2 l/s this implies that it can whiten 13,584 square metres (146,220 sq ft) a day, but in practice this area coverage is difficult to attain. These theoretical calculations indicate that up to 4.9 square kilometres (1.9 sq mi) it can be covered with a white deposit of 1 millimetre (0.039 in) thickness.

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