The only place in America where anyone who wants can shovel coal aboard an antique train.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

At 207 feet, one of the world's longest continuous escalators.

The narrowest house in America is seven feet of pure spite.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

This university transit system is a 1970's vision of the future.

The lasting remains of a historic spa.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

An abandoned coal mine reached by a steep hike.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

A historic coal mine that doubles as a museum and tourist attraction.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.