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

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 remnants of a 19th-century ironmaking complex hidden in the woods of Connecticut.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A 168-foot tower, part of the abandoned Chester Leadworks facility.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The western face was supposedly left clock-less to snub the Welsh.

Britain's oldest miniature railway.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.

Britain's oldest permanent theatre designed and built for puppets.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A 16th-century artillery fort built to protect England against European invasion.

A medieval quay that was the Mayflower's final port of call before sailing for America.

Perhaps the only prehistoric monument with its very own public bus stop.

A legendary rocking stone, returned to its clifftop perch.

A open air theatre built on a cliff by an eccentric British woman.

At high tide, the base of the lighthouse covers practically every inch of the island.

This stone once marked the boundaries of Liverpool's medieval markets.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

This abandoned lock-up was saved because of its connection to a local football team.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

This airport currywurst stand is made out of retro airplane parts.