This 18th-century water provider for Aranjuez was refurbished in 2013 only to be neglected again.

A beautiful modern church dedicated to the teleporting patron saint of Andorra.

This 317-ton walkable art installation is an homage to Korea's "City of Steel."

Outside a hilltop monastery in India, a monument to a 20th-century Russian mystic.

Mounds of fine golden sand that can rise nearly 500 feet tall.

Thousands of graves lurk below the surface of this park.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

The most unusual block in Brasília.

A series of concentric circles represented a bold new experiment in socialist urban planning, and it notoriously difficult to get around.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

An oversized, oddly designed pedestrian overpass has drawn comparisons to a commode for pachyderms.

Hues of distinctive blue to bluish-green color the slopes of these hills.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

An underwater restaurant, surrounded by a coral reef.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

The tomb of one of the greatest travelers in history.

This statue points to another unusual companion work of art often overlooked by visitors.

The largest hand-carved, outdoor sculpture collection in the state of Maine.

Sit at the "Disney table,” where Walt and his team of "imagineers" once dined on the regular.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

The equator passes through this tiny island in the eastern Atlantic.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

Beneath an ancient wishing tree lies an underground chapel with 12th-century frescoes and catacombs dedicated to a lady saint.