This former mining town was named the most toxic town in America.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

This university transit system is a 1970's vision of the future.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

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

Ship skeletons haunt Baltimore's waterways.

Dine on superb local staples in a converted historic church.

The ruined remains of a coal mining ghost town are hidden within the woods.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

This little museum in the town where zombies were born celebrates the living dead.

Metal monsters made from repurposed materials lurk alongside this Pennsylvania road.

The graffitied ruins stand hidden within the Pennsylvania woods.

A museum dedicated to Wales’ favorite—and strangest-looking—watercraft.

This park is home to a collection of important industrial and religious sites.

In a boatyard near Aberdyfi is a nautically inspired work of art.

A holy well believed to have healing powers.

Neolithic burial chambers hidden beside a village school.