The stones of this formerly witch-obsessed castle were used to build a church.

The best place to send your postcards home from Antarctica.

The "worst battleship ever built" is enjoying a grand second act, submerged 30 feet in the Gulf of Mexico.

A building so large that it has its own weather.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Rummage through this sunken ship, but leave your scuba gear at home.

The world's largest rotating world.

No Gordon Lightfoot song, only a barebones monument to greed.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

Charles Babbage's proto-computer, painstakingly brought to life.

A clock designed to run with perfect accuracy for 10,000 years.

A student driver's nightmare.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.