Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The commemorative stone column conceals a secret laboratory.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Catacombs turned marketplace.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The bronze uniforms commemorate the vital role of women during World War II.

A friendly pub with a sordid past in cock fighting.

Taxidermied animals galore, by appointment only.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

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.

One of Ireland's most infamous prisons for rebels including men, women and children.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

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

Stockholm's narrowest alley is barely over two feet wide.

A man has revenged his true love's betrayal through tears and stone genitalia.

This unique sculpture is often overlooked by pedestrians.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

An ornate sculpture of an ox in repose marks the former entrance to Nuremberg's medieval meat market, which was destroyed during World War II.