One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Tiny memorials honor individual victims of the Holocaust.

Metro station with a claim to rock n' roll fame.

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

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Where once there was a train station bathroom, there is now this German burger joint.

A fascinating insight into daily life in the Eastern Bloc.

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

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

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

The classic Atari game's iconic aliens have invaded downtown San Diego.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

Where monkeys run wild and the humans are caged.

Recycling meets art in this colorful barricade.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A clear blue swimming hole with hidden caves, still unexplored.

A museum dedicated to the alleged Roswell Incident.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

An impressive century-old, to-scale topographical map of Guatemala.

Giant kites are flown during this Day of the Dead celebration in Guatemala.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

An enormous, 30-story-deep hole in the middle of Guatemala City.