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.

Concerts, art, offices, and a café in what used to be Berlin's first crematorium.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

One of downtown Berlin's last reminders of its Communist past.

This sprawling Jewish cemetery is one of the largest in Europe.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A historic fire call point.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An eerie, derelict amusement park in Berlin.

One of the world's heaviest musical instruments towers within a popular urban park.

The highest rapid transit station in the world.

Before online banking and smartphone apps, there was "commuter banking" in the subway in Downtown Brooklyn.

Love is in the air along the small street in Brooklyn.

For 20 years, local pumpkins have met their fate on the iron fence surrounding this Cobble Hill home.

The famed amusement district marks the beginning of summer with a wild procession of nautical creatures.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

The site of good faith and good nature in the fictional world of Kcymaerxthaere.

Putting the "mod" in "modular" since 2000.

On a wall in linear London, a plaque hangs at the high water mark of one of the worst floods in fictional Kcymaerxthaereal times.

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

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.