Traditional 11th-century outdoor tannery.

The oldest known university in the world is in Fez, Morocco.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Former villa and estate of James Deering developed to preserve native tropical forests.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

A layered tribute to the work of mosaicist Isaiah Zagar.

An enormous, inside-out glass globe built in 1935.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

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

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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