America's post-nuclear-attack chambers of Congress.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

The oldest remaining authentic Putt-Putt course that Donald Clayton created in Ohio.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

It’s all about the Benjamins at this Atlanta museum with interactive exhibits.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.

Where the "World Pinball Champion” is crowned.

This dramatic rail curve was once the target of a failed Nazi attack.

Nothing says indulgence like a 1,500-pound chocolate castle.

These disused steel furnaces are now haunting ruins that may one day be a national park.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.

This baseball diamond was home to the Rockford Peaches, a team featured in the hit film "A League of Their Own."

This lush 12-acre site was once named the finest Japanese garden in North America.

A historic and oft-filmed prison stands in a Chicago suburb.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

A science teacher's dream.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

Where beautiful signs live on forever.

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.