AnimalsMind-BlowingAn underground fire in Australia has been burning for approximately 6,000 years, making it the world's oldest known coal fire.10712k17 years ago
HistoryMind-BlowingIn 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.689k10 years ago
PlacesWeirdThe 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.72k11 years ago
TrendingPlacesMind-BlowingThe Colosseum has a hidden underground corridor that Roman emperors used to enter the arena unseen and avoid assassination. Called the Passage of Commodus, it sat sealed beneath Rome for nearly 2,000 years. On October 27, 2025, it opened to the public for the first time after a year-long restoration. Part of the tunnel still leads toward an unknown destination.514 days ago