A walk through the historic city center, under the streets of Seattle.

The century-old remains of an abandoned farm town in eastern Washington.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A scenic ravine with an astounding collection of rock art created by the Indigenous people of the Great Plains.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

New fungal and bacterial species call this deadly lake home.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

An obscure waterfall that looks like something out of a fantasy novel.

The prototype for all Nazi concentration camps.

World's largest collection of serial killer artwork and other macabre exhibits.

Go surfing on this urban wave, "hacked" by local surfers.

The fairy tale castle of the "fairy-tale king."

A nearly abandoned 19th-century town on the Palouse.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.