Electrical curiosity museum housed in an old transformer station.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

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

This hidden art nouveau gem was designed by an architect in search of a national style.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

The whole world in one water tank.

Two dozen pinball games hidden away inside a most unlikely location.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.