Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

Singapore's landscaping project is home to 18 incredible Supertrees.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

These fantastically named natural pools look like something out of a Scottish myth.

A giant Troll lurks under one of Seattle's oldest bridges.

Elevated freight railway turned wildly successful urban park.

The fairy tale castle of the "fairy-tale king."

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

Pluto is still considered a planet in Ithaca, New York.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

This 16-foot, intricately detailed model of the Gearing-class destroyer has been called the most detailed model ship ever built.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

The oldest Roman lighthouse still in use.

The final resting place of the great navigator, or maybe his brother.

This Scottish burial tomb once held hundreds of ancient eagle bones.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A surreal statue honoring Prague's favorite literary son.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This automated sculpture of two men peeing will spell out text messages with their micturition.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

What looks like a suicide in progress is actually a statue of Sigmund Freud.