An eerie, decaying ghost town destined to fade into the forest.

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

These unusual rooms on wheels are holdovers from the 1960s.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

There’s a hidden military meme engraved on the World War II Memorial.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A little sculpture with a large wardrobe.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A book bound in the skin of an infamous criminal, along with countless other specimens.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A Civil War Museum with some notable medical antiques.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Home to items never before seen by the public.