Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Travelers exchange letters with woodland creatures at this mini post office.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today.

This historic Jewish cemetery sits right in the heart of a Detroit car factory.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

This haunting stone chasm is a hotbed of mossy rock and English legend.

The remains of a Canadian train crash are now mouldering beneath layers of rust and graffiti.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

This former coal mine has been turned into a sprawling modern art complex.

Tucked away inside a historic Savannah hotel is a hundred-year history presented in ladies' lids.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Spanking machines, fake goats, and more devices of humiliation are on display in this museum of fraternal initiation devices.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

A mad mystery man who led Canadian mounties on a 150-mile wilderness chase is still buried with his secrets intact.

An eerie, derelict amusement park in Berlin.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

A failed Russian themed village and amusement park in Niigata prefecture.

This abandoned amusement park was built on a site with a dark history.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.