This abandoned train tunnel has been the subject of countless ghost stories for years.

The aggressively banal name of this underground fortress of bureaucracy does little to evoke its truly surreal existence.

A museum dedicated to Nantucket's legacy as the "graveyard of the Atlantic."

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.

Home of the "Father of Forestry."

After serving in Vietnam, Korea, and even a stint in the Turkish navy, the unique ship is now open as a museum.

An inconspicuous suburban street corner is the site of San Diego's worst air disaster.

Abandoned landscape once home to "the world's largest winery."

A unique home built by Andrew Jackson Caldwell that also served as a military hospital.

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

Sites connected to a woman born on a ship and spared by a pirate.

It's believed Elvis Presley was inspired to write his breakthrough track after staying here.

A granite monument honors a beloved World War II canine mascot.

The 1920s child prodigy author was last seen here at her Brookline home before vanishing at age 25.

This Bronx apartment building is officially recognized as the birthplace of hip-hop.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

Buffalo's abandoned concrete grain elevators are getting a second life.

A homage to the King at the hotel where he revived his career.

The mall's looks were inspired by the cowboy extras who used to meet up—and cause real trouble—at this Hollywood hub.