A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A wondrous old library overlooking the nation's capital.

Home to items never before seen by the public.

This large stone residence served as a field hospital during the Battle of Gettysburg between stints as a tavern.

This Civil War monument was designed by an eccentric architect and Gettysburg veteran.

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

One of Gettysburg’s least visited battlefield memorials is off the beaten path, but worth a visit.

A diorama of the Civil War, fought by cats.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

A beautiful hidden gem in central West Virginia.

The 25th President's marble casket can be visited in this classical Ohio tomb.

In 1889, a small group of women began meeting to discuss literature, art, and other topics. Their every-other-week salon grew into a lending library that still exists today.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

Constructed by the younger brother of George Washington.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

Originally dubbed "Retirement" by the Navy Commodore who built it in 1780, this beautiful mansion is now the centerpiece of a suburban community park.

This church is known as "The Home Church of George Washington and George Mason."

Country fans may flock to Nashville's music scene, but this Appalachian town is where the genre was born.

A graveyard that dates back over 200 years stands near a busy shopping center.

The former home of the man whose radical ideas changed the nation.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

This monument is dedicated to those lost on June 6, 1944, in the town with that day’s highest per-capita casualty rate.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.