A scenic fort on the harbor protected Philadelphia from an attack that never came.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

The oldest still-operating tavern in the United States was once owned by a pirate.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

A wunderkammer hidden on the top floor of the Hartford statehouse.

The former location of a platform that allowed passengers to safely wait for the trolley.

This museum explores the history of policing and is also home to a very popular taxidermied duck.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

This memorial to the Mercury Seven astronaut stands at the site of his former elementary school.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

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

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

This former nursery supplied plants for the creation of Chicago's largest park.

Where a brain, a beauty, a jock, a rebel, and a recluse met one Saturday and changed their lives forever.

This cemetery is dedicated to the people who died fighting for democracy in South Korea.

Burial mounds of prehistoric Native Americans who lived along the DuPage River.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

This massive underground salt mine now holds a sci-fi theme park in its depths.