This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

These disused steel furnaces are now haunting ruins that may one day be a national park.

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

Adobe ruins punctuate the beauty of an 800 foot canyon carved by the Canadian River.

These aggressively sustainable art homes look like something out of 1970's science fiction.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

The first artificial white water river course in North America cuts right through an Indiana city.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

A Norwegian church that was built before Wisconsin was even a state has been entirely moved to a nicer spot.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

The highest bridge in America was built for an almost unnervingly small amount of money.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.