On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Op-art architecture designed for happiness.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The topiary maze at the Habsburg hunting lodge.

The site of Austria's biggest concentration camp now honors its victims.

The personal charnel house of Anton Bruckner.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

American soldiers discovered Europe's best one-liner at the end of World War II.

Ride a dragon train into a world of dwarves.

A Cold War secret surveillance tower used to spy on radio communications.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

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

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

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

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

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.

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

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.