Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The world's largest reflecting pool is just two centimeters deep.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

This Costa Rican topiary park is a surreal garden of unearthly delights.

This Quebec estate is home to the elaborate gardens of a self-taught horticulturist.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

This unique temple complex remains off the typical tourist trail.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

From printing money to live music, this Beaux-Arts style building has had many identities over the last century.

If Hello Kitty were Mickey Mouse, this would be Disneyland.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

The first spinning jail built in the United States is the only one that still turns.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This North Carolina store preserves a historic moment in America's movement for racial equality.

This Central New York ghost town was once a prosperous railroad community.

Where beautiful signs live on forever.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A remarkably opulent mansion with a tragic history.

The eccentric mansion of one the most popular horror authors of modern times.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

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