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

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

A restaurant and observation deck built in a unique broadcasting antenna.

Berlin's old airport.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

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

The most visited, and possibly most controversial, museum in Germany.

A colorful square marks the heart of the city's LGBTQ community.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

The fifth-longest natural arch in the world, and the longest outside China.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A tunnel with windows, so you don't miss out on the impressive views.

One of only two commuter aerial tramways in the United States.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A beautiful geyser under environmental threat.

Home to items never before seen by the public.

The first declared National Monument in the United States.

Macabre astrological automaton clock dating to the late 1400s.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.