Located in various parts of the world, these gravitational sinkholes pose a risk to unwary travelers and unsuspecting tourists. Be careful where you tread, lest you fall into the void.
This sinkhole in the state of Arizona, USA is notorious for its unpredictability. Steep drop-offs, jagged edges, and a general sense of unease will keep you on your toes.
Learn MoreThis massive sinkhole in the frozen tundra of Siberia is a marvel of geological engineering. Steaming vents, hissing pipes, and an otherworldly glow will leave you questioning reality.
Read MoreFor those who dare to tread, we have: