South Korea's largely symbolic, barely used gateway to the North.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Secret North Korean passage discovered below the world's most dangerous border.

Home to more than 13,000 pieces of war memorabilia and military equipment.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

Visitors to this public park will also find the ruins of an old western fort.

Make a wish at what might be America's only Catholic shrine to a sinner.

This scrap yard doubles as a naive art gallery full of found art and farm animals.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

Legend says train robbers stashed their gold within the depths of this unusual cave.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

The world's largest military aircraft cemetery.

The fading, forgotten remains of a once bright and booming factory.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

A brick-paved former section of the historic coast-to-coast highway.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

An ever-evolving wall of graffiti art off East Liberty Street.