Trade in that pesky human soul for cold-hard circuits.

House built with over 60,000 glass bottles.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

The house that took a plunge into the facade of a museum.

Baroque celebration of the end of the Great Plague of Vienna.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

A monument to the man who almost killed Hitler.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

This conical hill was built as a testing ground for an engineer known as the Glider King.

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

Art and a pun, all in one.

A collection of abandoned typographic signs from Berlin and beyond.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

This attraction is part anthropological journey and part amusement park.

A curious collection of miniatures in a quiet corner of the Chicago Children's Museum.

Huge abstract sculptures of the Puerto Rican Flag.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.