A historic observatory precariously perched at the "Top of Europe."

The second-highest train station in Europe.

A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

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

Designed as a reminder of one of the darkest moments in Austrian history.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

Berlin's old airport.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

A wunderkammer of mysterious objects and stories.

A towering monument to war, located on a beautifully peaceful hill.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Super-heavy Nazi architectural experiment.

A statue of an astronomer gazes at the sky as a tribute to Caroline Herschel.

A monument to the man who almost killed Hitler.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.