A dark, narrow tunnel that leads to a charming lake and waterfall.

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

On East Burnside, a 24-hour vending machine distributes world-class pastries.

This lake—the second largest in the state— was hiding historic treasures beneath its surface.

The first privately-owned space capsule to orbit and land carried a secret payload: a wheel of Le Brouère.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

The world's oldest bookshop still in operation.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Sip cherry liqueur at a bar dating back to 1840.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

Most famous work of one of Frank Lloyd Wright's sons.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Colorful Native American paintings are hidden within this small cavern.

This former boomtown "island" is now submerged below Folsom Lake.

Its dark depths conceal millions of rare, delicate crystal formations.

An old-timey medicine shop that once served Chinese laborers during the Gold Rush is still open for business to this day.

Visit a remnant California's Gold Rush, which locals claim is haunted by spirits from the past.

A plaque and memorabilia collection mark where A&W got its start.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

In 1975, a forestry worker in Arizona claimed to have been abducted by a UFO.