A relief that wraps around the concourse of Los Angeles's World Trade Center marks one of the city's failed urban design plans.

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

After several weeks of radio silence, this abandoned oil tanker washed up on a remote beach in Liberia.

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

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

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

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

This massive subterranean fissure is known as the "underground Grand Canyon."

Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

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

An unusual slot canyon in the Aztec/Navajo Sandstone has a cross-section like an inverted old-fashioned keyhole.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

The romantic botanic tunnel feels like a well-kept secret.

A unique rock formation that only a few have managed to venture inside.

How did a French journalist’s grave become the sexiest statue in the cemetery?

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

This Welsh dockyard was the site of the not-so-secret construction of the Millennium Falcon for the original Star Wars trilogy.

A seaside cemetery honors the Commonwealth soldiers and sailors that died in Sierra Leone during World War I and II.

This garage is frozen in the late 1990s, full of rare and untouched cars and motorcycles.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.