The 90-foot-tall Hōlei Sea Arch in Hawaii Volcanoes National Park lost a key part of its base on earlier this week and is now at risk of collapse, the park says National Park Service/J.Wei photos ...

As for what this means for the arch: "It could be here for another two centuries or two days." Need a break? Play the USA TODAY Daily Crossword Puzzle. The Holei Sea Arch is made from lava flow ...

It is a volcanic island that sits on a rocky platform about 32 feet (10 m) underwater, extending to the southeast, where a series of stone pillars, including Darwin's Arch, rise from the sea.