This incredible collection of vintage pinball machines can be played at 25 cents a pop.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

An acoustic anomaly with a mysterious cause.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A self-built castle made by a mysterious man.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Home to items never before seen by the public.

Towering basalt columns, a creation of fire and ice.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ghostly remains of an accidental sea.

This abandoned amusement park was built on a site with a dark history.

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

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The rocks in this arid basin leave trails of movement behind them.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Where America's first doomsday cult awaited the end of the world.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.