17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The oldest private art gallery in all of Hungary.

Time stands still at this serene burial ground in the center of Budapest.

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

A Hungarian optometrist's charming collection of Asian art and curiosities.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

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

Electrical curiosity museum housed in an old transformer station.

A forgotten graveyard lost in the tangles of an overgrown garden.

A fake Transylvanian castle houses a cathedral of antlers.

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.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

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.

A museum in the childhood house of a medical pioneer.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

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

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

Museum dedicated to the terror regimes of Hungary.