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

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

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

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

The only surviving piece of Copenhagen's 16th-century defensive wall.

Swedish skyscraper with a 90° twist.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

Once a meeting point for great thinkers, and the midpoint of the country.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

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

This sublime architectural marvel is a rare example of an expressionist church.

Did he come up with a theory of cosmic-ray showers while sitting in this bath?

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

This zombie-themed restaurant stands out in the heart of corn country.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

This hand-carved wooden carousel in the Story City North Park was built in 1913.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.