This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

The world's first motorway was used as a racetrack until the late 1990s.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

Art installations, derelict railcars, and endangered grasshoppers all call this south Berlin park home.

This monumental work of art symbolizes the coming together of a previously divided city.

The 1852 novel "Uncle Tom's Cabin" lends its name to a subway station, a street, and several shops on the edge of Berlin.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

This TV tower once secretly housed a GDR intelligence team.

A century-old shot ball factory tower is open to the public once a year.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Metro station with a claim to rock n' roll fame.

One of the world's heaviest musical instruments towers within a popular urban park.

Tiny memorials honor individual victims of the Holocaust.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

One of downtown Berlin's last reminders of its Communist past.

Floating swimming pool within a moored vessel.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".