Here are some of the most awesome geological wonders from around the world. Tulum in Mexico is famous for its cenotes Cenotes (pronounced seh-noh-teys) are essentially huge sinkholes in the ground ...

Sistema Sac Actun (Mexico) – Located in the Yucatán Peninsula, it's one of the world’s longest underground rivers, connected to ancient Mayan cenotes. Lost River (USA – Indiana) – This river vanishes ...