The oldest U.S. Government building in California, and it's State Historic Landmark #1.

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

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This banal Parisian entranceway is not what it seems.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A surrealist timepiece by the artist of melting clocks.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

France's most famous cemetery, with some of its most curious tombs.

From here, the loch appears to take the shape of mainland Scotland.

This Georgian mansion blends historical significance with an impressive art collection within picturesque surroundings.

This museum offers a glimpse into early 20th-century Glasgow life.

A ceramic postbox where visitors can post original poems and creative messages.

The celebrated eyesore created by starry-eyed sweethearts.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

This ancient theater was once the home of fierce gladiatorial battles.

This bridge was constructed from the rubble of the infamous Bastille.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Science fiction's grandfather has a fittingly marvelous tomb.

This demon atop the Notre-Dame de Paris looks utterly bored.

Historic medieval fortified city in southwest France.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.