A colorful architectural gem in Seattle's uniquely modern Central Library.

European castle ruins in an American state park are actually the product of death and grief.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

One of the ghostly stops along Route 66.

An extraordinary mixture of natural beauty and man-made phenomena.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Moonbows over Kentucky.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

This geothermal hot spring hides beneath a slowly growing mineral dome.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The ghost town that ended up on Ebay.

Outsider Art Community.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

This frequently-photographed waterfall takes only a short hike to visit.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A picture-perfect town, perfect for blowing up.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

An acoustic anomaly with a mysterious cause.