Boston and Philadelphia are renowned for their part in America's revolutionary saga, but these cities harbor an unseen connection ... the Freemasons. From the whispers of hidden tunnels and tombs beneath Boston's North End to the incredible waterworld still intact under Philadelphia, the legendary secret society has left behind the blueprints to America's rise. And their enigmatic influence stretches from the Revolutionary Battles of Fort Mifflin to the secret struggles of the Underground Railroad. Host Don Wildman receives exclusive access to newly discovered sites and clues and delves into a part of America's past that can only be revealed in the underworld. We're peeling back the layers of time on Cities of the Underworld: The Freemason Underground.

Four thousand years ago, a mysterious pagan society called the Hittites dug deep into the soft volcanic rock, called tufa, to carve out an intricate underworld. But after almost 800 years of rule, the Hittite Empire vanished without a trace. Where did their people go and what clues have they left behind in their complex subterranean world of Cappadocia?