Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

This Connecticut chapel is a starkly modern, and surprisingly colorful, architectural rebel.

An abandoned Depression-era zoo hidden just off the highway.

A former copper mine which became a truly unsuccessful prison.

It's not a typo, now say it five times fast!

This small-town Connecticut restaurant gives each diner a free book from its vast library.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

Who knew the Devil's domain was a hot spot for tubing?

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A miniature village lies nearly forgotten in the forest by the side of a major highway.

The remnants of a 19th-century ironmaking complex hidden in the woods of Connecticut.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

A historic Black graveyard hidden in the parking lot of one of America's largest malls.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

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

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.