This is Landscape Arch in Arches National Park, Utah. It's the longest natural arch in the world, at 290 feet long. Since 1991, several chunks have fallen from the thinnest section, including one that was over 70 feet long.

Landscape Arch
This is Landscape Arch in Arches National Park, Utah. It's the longest natural arch in the world, at 290 feet long. Since 1991, several chunks have fallen from the thinnest section, including one that was over 70 feet long.