Home to a timed geyser created by complete accident.

Home to the deepest rift anywhere on Earth.

A museum dedicated to the history and art of staying clean.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

On the side of a remote mountain, a stone face bearing an inscription of mysterious origin.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

A Frankenstein blend of science and art allows one tree to produce 40 different types of stone fruit.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

A former copper mine which became a truly unsuccessful prison.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

For those going through a life transition, a place to leave behind a piece of your former self.

The gravestone of the man who designed the plastic pink flamingo is adorned with his most famous creation.

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

Oldest existing wire suspension bridge in the United States.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

One of the few surviving examples of the first lock and dam system built on the Ohio River.