Stone carved Buddha and Bodhisattva, Cave No.20, Yun Kang Caves, UNESCO World Heritage Site, China, Asia

Hikers standing at entrance of cave

Hikers exploring rock cave

Ik Kil, Mexico, 20 December, 2019: Ik Kil Cenote located in the northern center of the Yucatán Peninsula, a part of the Ik Kil Archeological Park near Chichen Itza, Central America

Woman standing under the large, boulders on the seaside shores of The Baths, a famous beach in the BVI's, Virgin Gorda, British Virgin Islands, Caribbean

Diver at the bottom of an underwater cave 75 metres deep and which has been flooded for thousands of years (- 20 000 years). Mayotte

Diver at the bottom of an underwater cave 75 metres deep and which has been flooded for thousands of years (- 20 000 years). Mayotte