Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

The U.S. Fish Commission’s effort to mass produce carp.

There’s a hidden military meme engraved on the World War II Memorial.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A Jenga-style cylindrical tower of books that appears to go on forever.

A surreal statue honoring Prague's favorite literary son.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

Legends surround an ancient tree trunk riddled with nails for good luck.

Designed as a reminder of one of the darkest moments in Austrian history.

Dine amidst exotic plants at this former royal greenhouse.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Baroque celebration of the end of the Great Plague of Vienna.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

She stares out across six lanes of traffic, clutching a musket and infant with determination.