Moonbows over Kentucky.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

Inside a state forest, the forgotten remains of a Cold War defensive installation.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

This demolished goliath of American industry once loomed over the depressed town it once made thrive.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

Home of the only civilian casualty at the Battle of Gettysburg.

This tiny cottage surrounded by railroads is the oldest surviving structure in Fairmount Park.

This restored log building was one of the first toll booths for travelers along the Northern Turnpike.

Visitors to Salt Springs State Park are encouraged to literally put their two cents in Penny Rock.

Surrounded by industrial sprawl, a small monument marks the site of William Penn's first landing in Pennsylvania.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

This massive sycamore tree has been labeled as one of the largest in the state.

The slate extracted from these Pennsylvania quarries was once hailed as the finest in the world.

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

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