Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Lumps of significant stone from around the world surround a flaming monument for peace.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

One of the best-preserved pieces of DDR propaganda in Berlin.

Go surfing on this urban wave, "hacked" by local surfers.

The unusually large seat sits atop the base of a ruined temple.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Peace Park and the Atomic Bomb Dome.

An eerie reminder to the horrors of World War II.

A monument marking the first airplane flights in Japan hints at the dark history behind its peaceful park setting.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

This 700-year-old street food market features baby octopus and soy donuts.

A shrine contains nearly 200 statues of the Buddhist deity Jizo, dressed in bibs by parents who have lost a child.

A Japanese corporation has turned this small island town into living modern art gallery.

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

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

A 1,000 pound brass bell commemorates a time when this small maritime neighborhood was actually its own separate city.