The first, and perhaps only, monument dedicated to Wikipedia.

One of the most iconic neon ads of former East Germany.

The world's last remaining store of its kind.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

This cave holds a surprisingly colorful variety of geological oddities.

Vikings and Evangelicals have both had a hand in this replica medieval church.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

A unique botanical garden housed in three giant geodesic domes.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

This striking art museum holds an amazing series of curiosity cabinets.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

The building was originally a gas station built to resemble a Japanese tea house.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

A quaint Russian village in the middle of a German metropolis.

The "Prussian Versailles" that is as glorious today as when it was built.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

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.