A brush maker used his factory to protect blind Jews from the Gestapo.

A remarkable cabinet of curiosities in an art space in the center of Berlin.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

The stoutest tree in the world.

A museum in the former home of Marxist revolutionary Leon Trotsky.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

The largest geyser field in the southern hemisphere is a spectacular sight.

Berlin's old airport.

Art and a pun, all in one.

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

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

Cold war icon and onetime "hole" in the iron curtain.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A surreal museum of extraordinary industrial objects.

A fascinating insight into daily life in the Eastern Bloc.

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

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.