An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

Memorializing an American tragedy of massive proportions.

The first of Lancaster's "rural cemeteries."

It marks the spooky spot where the bodies of two young boys were found in the 19th century.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

A glittering Thai Buddhist temple in suburban Pennsylvania.

These lush botanical gardens employ the most purrfect pest control force.

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

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Local lore claims this park is named after a young woman who jumped off a cliff.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

The debris forms a solemn memorial to those who died in a 1963 accident.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

Trinkets and toys lovingly handmade by maximum security prisoners.

Former laboratory of radical psychiatrist Wilhelm Reich.

Scene of the grisly murder of two Norwegian women in 1873.

This 19th century granite fortification is one of the most well preserved forts in New England.

New England's tallest light house stands on an island with a history of cannibalism and death.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.