Tibetan-influenced mountain fortress in Northern Pakistan.

Lunar landscape, a mud volcano and bizarre rock formations.

An enormous alien invades Woking, England, as an homage to the H.G. Wells classic 'The War of the Worlds.'

This tangled English forest looks like something right out of a fairytale.

A domino effect created with Britain’s iconic telephone boxes.

This two-towered gateway is all that remains of the unluckiest pier in the world.

Britain's tallest megalith towers over the cemetery of a quiet English village.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

A world-class collection of mechanical musical instruments and automata.

The "Seinfeld" diner.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Singapore's oldest Hindu temple.

This house is one of the most colorful in the country, and is the last remaining example of a historic villa.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The highest point on the island known for buildings that touch the sky.

Little Red Lighthouse under the George Washington Bridge.

Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

Lewis Carroll's White Rabbit or something else altogether?

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A hands-off space for graffiti artists to hone and display their skills.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.