The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

This replica of the Greek structure is in the heart of Nashville.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Enormous lake at the bottom of a unique cave system.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest source of fossilized insects anywhere.

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

A beautiful combination of living flora with preserved bones covers the shelves of this shop.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

A multiversal transit station located right below a highway interchange.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

This 19th-century building inadvertently preserved the handprints of its builders within its walls.