This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

A museum dedicated to exhibiting remarkable outsider art.

The trials and tribulations of marking Poe’s grave.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

Huge masonic hall in Philadelphia with lavishly themed rooms.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

The world’s first penitentiary, meant to be humane, drove men insane.

A large visitor's complex and place of remembrance on the outskirts of the DMZ.

A monument to the two U.S. officers killed by North Korean troops while trying to trim a poplar tree.

The best place for scenic views of the DMZ and North Korea.

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.

Numerical symbolism abound at East Asia's oldest observatory.

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.

Tracking the 1,500-year history of Korea's star cabbage.