A beautiful geyser under environmental threat.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

Enormous lake at the bottom of a unique cave system.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The United States Capitol's former columns still stand.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Try not to get slimed in Tribeca.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.

A brick-paved former section of the historic coast-to-coast highway.

An idle pastime becomes a record holder in Boys Town, Nebraska.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

An Englishman loses his scalp to a Cheyenne warrior and lives to donate it to a library.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

Inside this magical collection, you can buy recipes cooked up by church ladies, motorcycle clubs, and clowns.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.