In the following, we offer you a selection of photos from around the world, suggesting to the viewer that it is a gateway to an underground world:
Patrick’s Well in Italy

Mutnovsky Ice Caves in Russia

Cerro Sarisarinama in Venezuela

Guatemala City Sinkhole in Guatemala

The Inverted Tower of Masons in Portugal

Dam’s Reservoir in California

Great Blue Hole in Belize

Hole for Diamonds in Africa
