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

The only parking meter in the entire town, it is surrounded by 100 free spaces.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

The world's largest fully steerable radio telescope.

"You don't need a rocket scientist to build a steam engine, but we've got one." -Museum docent on the credentials of a restoration volunteer.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

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

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The largest self-built castle in the U.S., six decades in the making.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

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