A Cold War–era underground nuclear bunker in Union County, Pennsylvania, has hit the market for nearly $2 million.

Wintertime visitors could be forgiven for mistaking Canada’s largest cities for abandoned, quasi-dystopian concrete jungles. Until, that is, they venture underground, where networks of passageways ...

A hidden passageway at Manhattan’s Merchant’s House Museum may be New York City’s earliest Underground Railroad site.

Find out how the underground or shadow economy can affect the accuracy of the calculation of a country's gross domestic ...

History has a way of silently hiding in the corners of a room before ...

A passageway hidden below a dresser at the Merchant’s House Museum had long been a mystery. Then researchers learned that the home’s original builder was an abolitionist.

NOHO, Manhattan (PIX11) — A living piece of Black history has been newly uncovered at a historic New York City institution. A ...