This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

A curiosity-seeker's paradise set inside a three-story historic school house.

One of the few surviving "Wigwam"-themed motels.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

This iconic Russian space museum sits on a landmark space production facility and houses the Vostok 1, the first manned spacecraft, that was also built here.

Nightmarish example of the unintended consequences of weapons testing.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

A rapidly disappearing authentic bit of the old south.

This natural wonderland is a unique chance to explore a Carolina bay, a mysterious geological formation of unknown origin.

An archaeological treasure trove towers over the valley of Chiavenna.

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

This underground power plant looks more like a super-villian's lair than a public work.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

One man spent 10 years building a spectacular section of road because no one else would.

A 4,000-year-old burial site hides behind a roadside Burger King.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

This ruined fortress was the stronghold for a persecuted medieval leader and his infamous Assassins.

At the United Kingdom's only residential library you can sleep among the books.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

Over 1.3 million confiscated wildlife products fill this macabre menagerie of illegal animal specimens.

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.