This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

Little Red Lighthouse under the George Washington Bridge.

A reportedly haunted 14th century church is curiously facing the “wrong direction.”

Gladiators once walked this ancient, subterranean passage.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

This historic former textile mill now houses a brewery, hotel, and what's believed to be the longest bar in the United Kingdom.

This coffee shop lies hidden beneath a historic church.

This star-shaped military outpost is now simply trying to protect itself from neglect.

Wander around the extensive remains of this 12th-century medieval church.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

A small house sits between two huge rocks, with its back to the sea.

The now-quiet remains of coastal artillery defenses that were used in both World Wars.

This memorial pays homage to the Royal Air Force squadron that breached two important dams during World War II.

This captivating Bronze Age timber circle spent centuries concealed by the tides.

Set amid the remains of a secret WWII airfield, this barn was preserved as a memorial to Allied agents who parachuted into Europe.

A 19th century grave house with a unique message formed by the stone supports to the railing around the walls.

Parts of this former military training ground may have inspired parts of J.R.R. Tolkien's famous fantasy series.

Visible at low tide, this rusting vessel is one of the last surviving examples of the X-Class "Midget" submarines.

In a small Kentish seaside stands the former home of one of the greatest science-fiction writers.