Underground Facts

An underground fire in Australia has been burning for approximately 6,000 years, making it the world's oldest known coal fire.

Mexico City is built on top of an underground resevoir!

In 1963, a man found a mysterious room behind a wall in his home that lead to a huge underground city that once housed up to 20,000 people, complete with schools, livestock pens, and food stores, dating back over a millennium.

A mole can dig a tunnel 300 feet long in just one night!

A mole can dig a hole 300 feet deep in one night.

The largest underground hotel suite in the world is located 21 stories below the surface in Arizona's Grand Canyon Caverns. The Cavern Suite sits in a 345-million-year-old cave and costs $1,000 per night.