The graffiti that birthed modern algebra.

Collection of still-functioning printing presses from the 18th to 20th centuries.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

A 1930s-style speakeasy with a secret doorway and one-of-a-kind cocktails.

A two-storey cabinet of wonders filled with the bizarre, the macabre, and the downright uncanny.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

This supermarket offers shoppers a window into the past alongside their groceries.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

The oldest public library in Ireland.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A restaurant and observation deck built in a unique broadcasting antenna.

Berlin's old airport.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Where once there was a train station bathroom, there is now this German burger joint.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.