From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

This small red school was where Germany signed their surrender during WWII.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This secret cemetery where no flag is allowed to fly holds the bodies of American soldiers convicted of heinous crimes during WWII.

A World War II officers' club features Old West murals painted by German POWs.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

Cannon designed to fire an atomic warhead.

The symbol was surreptitiously built into the river bank by German prisoners of war.

An unusual geological feature towers over the remains of a dark episode in United States history.

Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

Residential building on the Regents Canal is a breeding ground for creativity and innovation.

You will not be able to miss this building.

A remote lodge nestled among some of the world's best-preserved rainforests.

Hotel designed around a 16th century Mexican bullring.

This traditional Japanese-style house doubles as one of James Turrell's colorful works of art.

A piece of telecommunications history.

Edinburgh’s version of the Sistine Chapel is this former church, with an interior covered in paintings done by one woman over the course of nearly a decade.

A hand-painted advertisement for chocolate adorns the walls of this historic building.

This building contains a door only used by members of the royal family.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

Vermont's hills are alive with the sound of music at this historic hotel.