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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Hear the quietest sound from across the dome.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

A little sculpture with a large wardrobe.

Go inside to really appreciate this 500-year-old technological masterpiece.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Famously misunderstood wonder of the ancient world

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

The celebrated eyesore created by starry-eyed sweethearts.

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

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

Three columns of volcanic rock shoot out of the ocean.

This tiny museum's sizable collection is jammed into a former underground public toilet.

This stunning concert hall has become a symbol of Iceland's national recovery.

An encyclopedic collection of mammal penises.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.