This London plaque marks the spot where David Bowie's famous alien made his debut.

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

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

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

These ornate arches show how the course of the River Thames has changed.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The largest clown school in Britain offering accredited degrees.

This Underground station has been a popular filming location for decades, even before it closed.

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

Ship-sized kinetic sculptural fantasy.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

One part local history, 99 parts gruesome haunted house.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

Famously misunderstood wonder of the ancient world

A popular day's outing in Bovington consists of watching military tank driving practice.

A Nazi concentration camp and Anne Frank's place of death.

The prototype for all Nazi concentration camps.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

This road earned its macabre nickname after hundreds of Iraqi troops died along it in 1991.