In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

A gift from Emperor Franz Joseph I to his wife.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

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

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

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

The medieval network of canals hidden underneath the city is opened to explorers each year.

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

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

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

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

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

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Apartment complexes built into huge repurposed natural gas tanks.

The resting place for anonymous victims of the Danube's dark waters.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Huge stairway leads to this massive gallery.

Destruction from Armenia's 1988 earthquake inspired an artist's sculptures of scrap metal.

Called the "Armenian Stonehenge," this ring of menhirs pierced with holes may be a prehistoric astronomical observatory.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.