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

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

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

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

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

This conical hill was built as a testing ground for an engineer known as the Glider King.

Floating swimming pool within a moored vessel.

Super-heavy Nazi architectural experiment.

A collection of abandoned typographic signs from Berlin and beyond.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This delightful little museum is dedicated to only one thing: pasta.

This room of wonder is full of relics, from knights in armor to rare works of art.

A 15th-century monumental Latin inscription on this house celebrates Lorenzo Manilio's love for Rome.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

The meaning behind this triumphal Roman arch was a mystery until the early 20th century.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

A colossal aqueduct from the second century B.C., deeply hidden in a gorge on the outskirts of Rome.

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

A statue representing a lost Roman profession that was vandalized for centuries.