The infamous Lake of Death

The Guatemala Sinkhole

The infamous Lake of Death kills any living organism that inadvertently appeared in its water. And it's not the only dangerous place on our planet.

Sinkholes are formed when the bedrock of the earth is slowly worn away by erosion until there is just a thin layer of soil or rock remains on the surface with a hole underneath. Sinkholes have appeared in various places in recent years, such as in the US and Sweden, but perhaps the best known is this 30-storey-deep hole in Guatemala.