This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

A two-way chairlift system between Zugliget and the highest point in the city.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A series of playful yellow penguins share a serious message about the environment.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

This picturesque abandoned home is rumored to be a spite house.

A sweet symbol marks the place where torturous executions were once carried out.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

The last remaining 19th-century tenement from Boston's old West End neighborhood.

This impressive Boston holy house is the American mecca for Christian scientists.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

The world's largest piece of copyrighted artwork.

Millions of numbers carved in glass represent the tattoos forced upon victims.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.