Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

This icon of the Atomic Age now lays dormant.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

This landmark cemetery in Boston was created more than 300 years ago.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The "All-Seeing Eye of God" symbol on this library is a clue to one of the many former lives of this building.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Winding country roads in eastern West Virginia lead to an extraordinary place populated by fiberglass giants.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

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

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

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

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.