An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

Hidden beneath the streets of London is a secret subway that only carried mail.

Every autumn, this hillside is ablaze with red summer cypress.

The largest underground church in Europe.

An abandoned castle owned and ignored by Masons carries a cursed history.

After a short 5 year run, this former major theme park sits in ruin.

Experience a charming 1930's version of "infotainment."