Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Copenhagen's celebrated theme park and gardens.

A ruined hotel with an unlucky history and an eerie present.

Where a great scandal unfolded with a famous female revivalist at its center.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

One man's unrequited love stands in a glass box forever.

This mosaic-covered bar is brimming with curated curios.

The haunting peak of an old church is all that remains of a drowned Brazilian city.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This free, take-a-book shop seems like a trick but isn't.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A wall of chewing gum moonlights as collective art.

Artist James Turrell's ode to dawn and dusk on the campus of Rice University.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

A taste of Middle Earth, in the middle of the Bayou City.

A park filled with vibrant mosaics created by more than 300 folk artists.

A failed piece of Orientalism has become the proud symbol of a community.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

A one-of-a-kind collection of a unique medium.