A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

The resting place of a Civil War celebrity's amputated limb.

A small Richmond island dotted with the remnants of hundreds of years of history.

An original apothecary from 1792.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

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

This maze-like slot canyon is a unique gem within an already fascinating geological area.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

A diorama of the Civil War, fought by cats.

The highest point in Maryland is only accessible by hiking through another state.

Two gems of Beaux Arts architecture that have been sitting vacant for years.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

Where the oil industry began.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

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

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

An American flag was erected for every day that passed during the Iranian Hostage Crisis.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

There is beauty and history in the ruins of this former company town.

The site of America's first commercial oil well essentially disappeared after the town went bust.