Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

A small, forgotten prison cemetery marked only by a wrought-iron fence and eerie depressions left in the ground.

A whopping 14,000 copper coins cover this miniature fighter jet.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The skeletal white beams stand as a monument to religious dissent.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The resting place of a Civil War celebrity's amputated limb.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.