The house that took a plunge into the facade of a museum.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Austria's very first and only nuclear power station was completed but never used.

The world's most important buildings shrunk to a tiny size.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

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

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Apartment complexes built into huge repurposed natural gas tanks.

Double spiral staircases are not unheard of, but they are very rare.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Baroque celebration of the end of the Great Plague of Vienna.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Take a cruise with no movement but plenty of style in this one-of-a-kind boat mall.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Tucked away in a corner of a Maine general store there was a museum devoted to an equally beloved and reviled local soft drink.

On Hurricane Island, a former ghost town has been transformed into a forward-thinking research center.

Plaque remembering the 18th century forced relocation of Acadians.

A beautiful, water-filled quarry that has become a popular haunt for swimmers and artists.

A mural of a boy making a phone call connects a southern Maine community to a town in Iraq.

The remains of a large iron mill that once stood in the remote woods of northern Maine.

This architectural onion has an original 1930's Jerry O'Mahony dining car at its core.

Built for television, this statue now serves as an unlikely memorial to a fireman who died on 9/11.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.