The largest burial mound in the United States holds the remains of prehistoric West Virginians.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

A larger than life statue of a steelworker keeps watch over a closed steel mill.

Francis Julius LeMoyne built this crematory in 1876; he was the third person to be cremated here.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

The site where nine miners were trapped underground for over 77 hours in 2002.

A piece of crumbling highway infrastructure was repurposed as a high-tech facility for testing racecars.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

This historic furnace was once used to produce cannonballs during the Civil War.

A miniature golf course crafted inside the world's largest simulated cave.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

The train collection of an eccentric New England seafood mogul is now a National Historical Site.

A sycamore tree grown from seeds that traveled to the moon.

A wonderous place devoted to art and metal.

A collection of bite-sized buildings creates a magical mini village in the Pennsylvania mountains.

Memorializing an American tragedy of massive proportions.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

A bronze ballot box stands at the spot where Susan B. Anthony voted illegally.

Eclectic architecture in the woods of New York.

An extraordinary collection of vampire-themed antiques lurks on the second floor of a store.

A "house to which to flee" for settlers in colonial Pennsylvania.

A fascinating community art piece created by students, teachers, and noted Philadelphia artist Isaiah Zagar.

Hidden behind an empty field resides this early 19th-century cemetery.