Prohodna is a cave in north central Bulgaria, popular tourist attraction for the two eye-like holes in its ceiling that create an eerie effect. Prohodna is 262 meters (860 ft) long, and has two entrances which lie opposite one another, known respectively as the Small Entrance and the Big Entrance. The cave owes its name, which literally means Thoroughfare Cave or Passage Cave, to this feature. Prohodna is most notable for the two equal-sized holes in the ceiling of its middle chamber. The holes, formed through erosion, let in light into the cave and are locally known as the Eyes of God or Oknata.
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Torysh, also known as the “Valley of Balls”, is located close to the town of Shetpe in Western Kazakhstan. The rounded concretions are 120-180 million years old and their size reaches 4 m in diameter. Geologists do not have a single opinion about the processes that created these mysterious formations. The balls are believed to be concretions —a hard, compact mass formed by the precipitation of minerals. The phenomenon is not rare — examples of such concretions are found all over the globe.
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Monemvasia is located on a small island off the east coast of the Peloponnese in Greece. The island is linked to the mainland by a short causeway 200m in length. Its area consists mostly of a large plateau some 100 meters above sea level, the site of a powerful medieval fortress. The town walls and many Byzantine churches remain from the medieval period. The medieval buildings have been restored, and many of them converted to hotels.
Monemvasia’s nickname is the Gibraltar of the East or The Rock. The island of Monemvasia was separated from the mainland by an earthquake in 375 AD.
The Trou de Bozouls is a horseshoe shaped gorge, 400 m in diameter and more than 100 m deep, located on the territory of the commune of Bozouls, in Aveyron, France. This encircled meander has been dug by the erosive action of the current waters of Dourdou in the secondary limestones of Causse Comtal. The unique geography of the area came about 2 million years ago when glaciers advanced and receded. Humans have built settlements in the area for thousands of years, using the limestone rock to create their dwellings.
Photo credit: Mairie-bozouls/Wikimedia
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The Fairy Doors of Ann Arbor are a series of tiny doors that are a type of installation art found in the city of Ann Arbor in the U.S. state of Michigan. The first public fairy door appeared outside Sweetwaters Coffee and Tea in 2005, installed by Jonathan B. Wright, a teacher of graphic design technologies. There are ten public Ann Arbor fairy doors, but the idea has also spread to other nearby towns.
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