Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This massive blockhead sculpture hides an entire library.

This saucy statue once caused outrage among locals.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

France's national museum of scientific and industrial instruments.

The first green space constructed on an elevated viaduct.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

The sculpture of the deceased cockatoo flops atop its personal plinth.

These stained-glass windows are all that remains of a building that was the target of one of the biggest explosions in London after World War II.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

One-time largest man-made structure in the world will be a park in 30 years.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

The metal spire on the roof of this tower was intended as an airship docking station, but it was never actually used.

A collection of huge Pre-Colombian structures in Alabama.

The tallest monument in a historic New Orleans cemetery was prompted by romance and dash of pettiness.

New Orleans' famous cemetery, located on the site of a former race track.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

Striking images of New Orleans history, including colonizers, soldiers, Klansmen, scientists, sharecroppers, and more, are depicted in frescoes that line the walls of this transportation hub.

In 1857, the Mardi Gras parade tradition began at this intersection.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.