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

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

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

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

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

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

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

A statue of an astronomer gazes at the sky as a tribute to Caroline Herschel.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

Home to a timed geyser created by complete accident.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A towering bronze statue memorializes the founding father of postwar American conservatism.

Ancient pueblos built into the base of a natural canyon wall.

A replica of the flagpole that gave a frontier town its name.

This historic national park is covered in the stunning ruins of red rock pueblos.

More than a century old, this trading post resides in the Navajo Nation.

The walls of the statehouse tell the story of Ohio’s prehistoric past.

Where animatronic singing fish go to retire.

A beautiful South Korean gate and garden in Little Rock honors American Taekwondo.

Yup, that's where the name came from.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

Two gushing waterfalls of hot spring water within a block of each other.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.