Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

Sweden's "good old days" painstakingly re-created in a model village.

This Stockholm light tower can be controlled by anyone with a smartphone.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

A ghost town originally established and governed solely by Black Americans seeking a place of their own, free from discrimination.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

Giant jewel-toned statues fill the grounds of this Cambodian Buddhist temple in California.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

This Southern Californian Conservation Center is home to singing and howling apes.

This ramshackle ghost town is comprised of mining-era buildings collected from around the region.

One of the last free public hot springs is decorated with hippie art.

World War II-era Nazi compound nestled in the Santa Monica hills.

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

This watchtower once presided over the Berlin Wall.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A monument to the man who almost killed Hitler.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

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

Tiny memorials honor individual victims of the Holocaust.

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

A fascinating insight into daily life in the Eastern Bloc.