An elevator into the Baltic Sea.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

Handsomely crafted representations of our round planet.

In the fictional world of Kcymaerxthaere, standing at this site just outside Vienna, Austria, the sky would have been found beneath your feet.

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

The solemn exterior conceals an opulent interior of this 17th century church.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

An exquisite Baroque church in Vienna's old town.

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

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

Op-art architecture designed for happiness.

A spherical "micro-nation" in the heart of Vienna.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

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

This museum promotes informed contraception by documenting its often secret past.

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