An abandoned Cold War missile radar site.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

Long before air conditioning, Persian architects found an ingenious way to cool off.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

A one-armed veteran of the Battle of Waterloo lies in a cemetery for one in the middle of a Chicago scrapyard.

Its impressive still-working beam engine is a thing of beauty for engineering history fans.

This once-booming gold mining hub was basically abandoned overnight.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

A former top secret military tunnel is now stuffed with snow and open year-round to skiers.

A Nevada mining boomtown that ran out of silver and luck.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Hidden in the shadow of a rocky fortress is one concubine’s long-forgotten legacy.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

An abandoned tower once used to study the cosmos hides within a thicket of greenery.

This picturesque abandoned home is rumored to be a spite house.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.