Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

A Turkish ghost town abandoned in a population exchange with Greece.

The remains of diamond fever taken over by the desert.

This Tang Dynasty behemoth is the biggest Buddha in the world.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

This ancient burial mound is accessed by an impressive Greek-built archway.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

The illuminated falls are a gem in North Cascades National Park.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

These winged Maya figures are the subject of speculation and conspiracies.

The best-preserved example of a unique structure in Nubian architecture.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

The largest hewn stone in history.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

The only residents of this abandoned housing development full of identical castles are stray cats and dogs.

Terrifying derelict military hospital once housed a recuperating Hitler.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.