A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Freddie Mercury's childhood home is now a monument to the iconic Queen rockstar.

This demon atop the Notre-Dame de Paris looks utterly bored.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

The walls and streets of the ancient city are peppered with penises.

The earliest known map to show America, discovered by accident at a Paris bookshop.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Breathtaking and huge 430 year old maps of Italy.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

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

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.