
20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

VAN, TURKEY - APRIL 13: 20 meters long and nearly 16,000 years old microbialites are seen in Van's Adilcevaz, Turkey on April 13, 2019. ( Ali İhsan Öztürk - Anadolu Agency )

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.

20-meter high rock formations known as microbialites dating back some 16,000 years old (stalagmites) in Adilcevaz in Van, eastern Turkey. Formerly underwater, they provide clues about the ancient history of Lake Van.