A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

A World War II-era submarine is stuck in the mud in New Jersey.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A world-class collection of mechanical musical instruments and automata.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

Series of storm drains connected to a dark urban legend.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.