The Atlas Obscura Guide To Arco

3 Cool, Hidden, and Unusual Things to Do in Arco, Idaho

Updated March 11, 2014

Unusual Attractions in Arco

Kings Bowl and Great Rift from air. King's Bowl is a phreatic explosion pit 280 feet (90 m) long, 100 feet (30 m) wide, and 100 feet (30 m) deep, caused by lava meeting groundwater and producing a steam explosion 2,200 years ago. (Wikimedia Commons)

Arco, Idaho

Craters of the Moon National Monument and Preserve

Home to the deepest rift anywhere on Earth.

Arco, Idaho

Experimental Breeder Reactor-I

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

Arco, Idaho

The Devil Boat

Supposedly Satanic numbers adorn this preserved submarine sail.

Are we missing something unusual?

Add it!

In partnership with GetYourGuide

Unforgettable Experiences Nearby

Atlas Obscura Itineraries

6 Stone-Cold Stunners in Idaho

It turns out that no one really knows how Idaho got its name. It's been thought that the name came from Shoshone, but in truth it may have just been made up by a somewhat shady politician. Regardless of what you call it, the Gem State is sparsely populated and unapologetically wild, and full of wonders—especially geological ones.

View Itinerary