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

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

Home with Gothic windows featured in a famous painting.

This historic cliffside mansion uses a natural cave for air conditioning.

A diverse, expansive nature preserve in northeastern Kansas.

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

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

There aren't too many operational funiculars around, but Pittsburgh has two!

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

An outlandish shoe shaped house built by an eccentric millionaire.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

A suspended garden, now gone, once hung in the middle of this abandoned church.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

Moonbows over Kentucky.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

Visit this playground of waterfalls, caves and sinkholes.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."