Spanning 25 miles in diameter, this crater is three times the size of the Grand Canyon, making it the largest known impact site in the U.S. and the 15th largest on Earth.

An account of the discovery and exploration of the two-mile crater on the barrens near Hudson Bay. If it is conclusively shown to be meteoritic, it is the largest yet found on earth By V. B. Meen ...

Beneath the waters of Chesapeake Bay lies a massive secret that took decades to uncover. What once seemed like a normal stretch of water has been revealed as the site of a colossal impact crater ...