Today, Lubań, Poland is known for its tranquility, historic architecture, and small-town charm. Less than a century ago, the city was enveloped in one of World War II's hotspots. Josh Gates (gatesygram) is on the ground in hopes of uncovering hidden artifacts leading to a buried, Nazi installation - and secrets that have never met the surface. 📜 #ExpeditionUnknown premieres tonight at 8p ET on Discovery and streaming on discoveryplus, followed by #ExpeditionX and #JoshGatesTonight.