The world's largest piece of copyrighted artwork.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

Dim sum, served in a grand old theater.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

"If she'd leave us alone, we would have a happy home, sent from down below."

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

The first green space constructed on an elevated viaduct.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

A unrivaled and rather horrifying collection of wax dermatological models.

Statue of death tucked in the University of Medicine courtyard.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A surrealist timepiece by the artist of melting clocks.