Hear the quietest sound from across the dome.

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Cold war icon and onetime "hole" in the iron curtain.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Everything from miniature biblical scenes to life-sized statues are almond-based at this sweet and nutty gallery.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

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

Central Europe's largest collection of mini-bottles is on display at this museum devoted to a bitter Hungarian liquor.

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

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

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

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

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

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

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

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

Museum dedicated to the terror regimes of Hungary.