Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Cat art as far as the eye can see.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

Museum preserving torture methods from the past.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

San Francisco's newly reopened hands-on science museum.

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

Experience park where visitors are told to expect the unexpected.

An abandoned castle owned and ignored by Masons carries a cursed history.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

Architectureal fantasy quarter of Rome.

The longest hedge maze in the world.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

360° views of the city plus five floors of optical illusions and hands-on science.

Hollowed out cedar log tubs set in an ancient towering forest.

A heavenly experience, right here on Terra Firma.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Olfactory delights in San Francisco's Botanical Gardens.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.