Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

Apartment complexes built into huge repurposed natural gas tanks.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

Europe's second largest ossuary wasn't discovered until 2001.

Mummified monks and the accidentally interred, in a 17th-century crypt.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

Visiting this café is like visiting the Austrian grandma you wish you had.

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

Fantastic stories on a miniature railroad.

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

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

A glimpse into the festive and private lives of medieval Europe.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Dine amidst exotic plants at this former royal greenhouse.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The first modernist church in Europe.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

An ornate private entrance to the Vienna subway built specifically for the emperor.

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

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

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