Mayan Ruins: Caracol is the largest known Maya site in Belize and one of the biggest in the Maya world. Caracol had an estimated population of people. The enormous central core area covered 15 square miles. Credit: Patrick J Endres
Blyde River Canyon is Mpumalanga, South Africa. It is a 26 km long, 2500 deep canyon covered with vegetation, making it the largest green canyon in the world. Read more: AfricVilla: Today's photo: Blyde River Canyon, South Africa
Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.
The Baatara gorge waterfall (also known as the “Cave of the Three Bridges”) in Tannourine, Lebanon. The waterfall drops 255 metres ft) into the Baatara Pothole, a cave of Jurassic limestone located on the Lebanon Mountain Trail.