Pennsylvanian mass grave and possibly mass murder.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

The smallest and oldest covered bridge in Delaware.

The second oldest and longest of Delaware's three covered bridges.

The first marker along the famous boundary.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

An abandoned stretch of highway, deteriorating next to the operational one.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

A 20-foot-tall quarter commemorates George Washington’s ties to Bedford County.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

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

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

Home to one of the most popular teams in Scottish football history.

A remarkable feat of Victorian engineering across the Firth of Forth.

Every New Year's Day, locals don gaudy costumes and dive into the frigid Firth of Forth.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

FDR's Art Deco hospital tower was hopelessly inefficient.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.