This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A century after his death, this covered bridge still calls to mind the plein air painter who loved it.

Turns out you can see the world without ever leaving Maine.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

The celebrated eyesore created by starry-eyed sweethearts.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

An architectural oddity hides in plain sight on this iconic London bridge.

Murals of the wild parties once held on the frozen River Thames.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This one has sailed five times as far as Sir Francis Drake's famous ship.

An incarceration museum on the spot of possibly the oldest prison in England.

An unusual round church in London with a Templar past.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

Nope, not Washington Irving's house.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

The first piece of public art dedicated to LGBT rights.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.