Underground tunnels remain beneath this abandoned mental asylum.

A vast collection of rare books, manuscripts & extraordinary objects illustrating the history of medicine.

A castle inspired by medieval architecture is hidden in the woods of Connecticut.

The stone sculpture of an Ottoman soldier is an homage to a lost Providence landmark.

A plaque marks the spot on the bridge where one of the first elephants in the U.S., Little Bet, was gunned down.

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

The largest fountain in Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

Eighty million natural history specimens call this gargantuan museum home.

San Francisco's newly reopened hands-on science museum.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Macabre astrological automaton clock dating to the late 1400s.

A trash dump made beautiful by nature's power.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.