A former squatter's paradise outside Prague.

This doorless 20th-century elevator doesn't stop or slow down.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

Microscopic scenes; some call it novelty, some call it art.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

Apartment complexes built into huge repurposed natural gas tanks.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

"Medieval" castle built in the mid-20th century by one family.

A three-shelf library serves as a memorial in the Jewish cemetery of Krems.

A cableway for car transport.

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

The topiary maze at the Habsburg hunting lodge.

A silly medieval mural preserved on the side of a Viennese house.

This former insane asylum now holds a pathological anatomy museum.

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

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

This cubist Vienna church building looks like some sort of alien stonehenge.

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

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

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