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

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

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Too much gossip or just missing curfew could land you in here for a couple of days.

Monasteries on rock pillars, once accessible only by frayed ropes.

A subterranean house of worship carved right out of the bedrock.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A motel dedicated to Southwestern nostalgia.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

A French museum of wrought iron.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The "lovely red Vega" of the legendary record-settling pilot.