The FBI's urban training course may have the highest fake crime rate in the world.

The resting place of a Civil War celebrity's amputated limb.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

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

A small but immensely extravagant palace built by the "Night King."

This doorless 20th-century elevator doesn't stop or slow down.

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

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The prototype for all Nazi concentration camps.

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

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Strange rumors surround the artist who created these solemn metal guard dogs.

Peace Park and the Atomic Bomb Dome.

The bears of Bern have been a city highlight for over 500 years.

Historic site where Native American hunters once trapped and killed buffalo.

This is the oldest Roman-made bridge in the city still existing in its original state.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

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.