On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

A naturally mummified 2,000-year-old man.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

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

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

There's an exclusive Beefeaters pub hidden in the Tower of London.

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

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

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

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

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

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

This bookstore serves recipes from the cookbooks on sale.

Catacombs turned marketplace.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

A historic arboretum and non-conformist, non-denominational park cemetery.

You can still see bits of the camouflage used to hide this Art Deco building from bombers during World War II.

An archway adorned with vulnerable flora and fauna.

Giant, friendly pelicans in Central London, the most unlikely of places.

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

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

Ancient ruins hidden underneath a modern luxury hotel.