Atop this library is one of the most beautiful green spaces in Warsaw.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

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

A set of outdoor stairs named in honor of a famous Austrian artist.

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

Journey through a mesmerizing array of board games inside this museum.

This "mathematical tower" was an observatory, early skyscraper, and place to reflect on all of nature and the cosmos.

An IT-specialist-turned-farmer reintroduces an Austrian food tradition while promoting snails as a sustainable "future food" option.

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

The shell of a medieval fortress offers commanding views of the area it once protected.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Visitors dip into a variety of pools of what was once ice.

Ride a dragon train into a world of dwarves.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

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

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

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

Artfully arranged bones of 5,800 Austrians.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Apartment complexes built into huge repurposed natural gas tanks.

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

Legends surround an ancient tree trunk riddled with nails for good luck.