The largest cemetery in the American Southeast is a hidden gem near the heart of Atlanta.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This historic mansion was built as a symbol of love between a husband and wife.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

Pittsburgh's literal underground railroad.

One of the oldest of its kind.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

An Irish Memorial commemorating those who perished due to potato blight.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

This jail which was in service for over a century is now open for curious visitors.

It would take 35 firetrucks to fill this enormous glacial pothole.

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

Yo, Adrian!

A local prank turned town icon.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

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

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

Long hidden under grime, the politically radical murals of a little known Yugoslavian master are finally getting their due.

A field of nothing but boulders which resembles a giant's gravel driveway.