Leśna (historically known in German as Marklissa) is a small town of approximately 4,439 residents situated in Lubań County, Lower Silesian Voivodeship, in south-western Poland, close to the Czech border and the Kwisa River. The town sits in a region that was part of Germany during World War II and is surrounded by landscapes that once concealed a remarkable amount of Nazi military infrastructure — bunkers, tunnels, and secret facilities carved into the hills of Lower Silesia. Today visitors may recognize the area from its proximity to the medieval Czocha Castle, which Gates uses as a staging point in the episode, describing it as the oldest building in town. In Season 15 of Expedition Unknown, Gates travels to Leśna to meet Dr. Charlie Hall and begin digging into the story of Hitler's so-called Amerikabomber — a never-completed long-range bomber program the Nazis hoped could bring the war to the United States. The town's quiet, postwar character belies the wartime secrets Gates came here to investigate.
The area around Leśna, then known as Marklissa, develops as part of the Silesian region under successive Central European powers.
The region, as part of wartime Germany, becomes home to various Nazi military and industrial activities, including underground facilities in Lower Silesia.
Following Germany's defeat, Lower Silesia is transferred to Poland; the town is renamed Leśna and the German-speaking population displaced.
Gates arrives in Leśna for Expedition Unknown S15E01 "Hitler's Amerikabomber" to investigate the legend of a secret Nazi long-range bomber program.
Leśna sits in a part of Lower Silesia that historians regard as one of the most archaeologically intriguing regions from the Nazi period. The area is riddled with evidence of wartime construction — underground bunkers, rail tunnels, and concealed industrial sites built using forced labor — many of which have never been fully documented or excavated. Gates' episode uses the town as a gateway into this larger story, with Dr. Charlie Hall serving as a guide through the historical and physical evidence.
The Amerikabomber program itself is a well-documented episode in aviation history, though its physical remnants are scarce. Hitler's desire to strike the American mainland drove German engineers to develop several ambitious long-range bomber prototypes in the final years of the war. As Gates frames it in the episode, the Nazis were racing to build a plane that could cross the Atlantic — but most designs never left the drawing board, and those that were built were destroyed in Allied air raids or at war's end. Historians generally agree the program was technologically feasible in concept but crippled by resource shortages and the overwhelming Allied air campaign.
What remains genuinely debated is whether any documentation, components, or prototypes survived the war's chaotic final months — particularly in Lower Silesia, where Nazi officials were known to relocate sensitive materials as the Eastern Front collapsed. Local legends and postwar testimonies have long hinted at hidden caches in the region's extensive underground network, though none have been definitively confirmed by mainstream archaeology.
Gates' episode does not claim to resolve these questions, instead using Leśna and its surroundings to explore how close — or how far — the Nazis actually came to realizing this particular dream. The episode is honest about the ambiguity: the Amerikabomber remains one of history's more tantalizing 'what ifs,' and the investigation raises as many questions as it answers.
Leśna was historically known by its German name Marklissa before the region was transferred to Poland after World War II in 1945.
As of 2019, Leśna has a population of approximately 4,439, making it one of the smaller towns in Lower Silesian Voivodeship.
Lower Silesia is home to an extensive network of Nazi-era underground tunnels and bunkers, some of which remain only partially explored decades after the war.
Hitler's Amerikabomber program aimed to produce a bomber with a range exceeding the Atlantic crossing — a technical benchmark that Allied aircraft like the B-29 Superfortress, with a range of more than 5,000 miles, had already approached.
Leśna is a small working town in Lower Silesia, generally accessible by road from Zgorzelec or Jelenia Góra. The nearby Czocha Castle is a notable draw for visitors and is open to tourists during regular operating hours, though visitors should check current schedules in advance. The surrounding Lower Silesian countryside contains a number of wartime-era sites, many of which are on private land or require guided access.
Zgorzelec (on the German-Polish border) is approximately 30 kilometers to the northwest; Jelenia Góra lies roughly 40 kilometers to the south.
Late spring through early autumn (May–September) offers the most comfortable conditions for exploring the region, with mild temperatures and accessible countryside. Winter in Lower Silesia can be cold and grey, though the castle and forested hills take on a dramatic atmosphere.
Wrocław (Breslau)
Wrocław (formerly Breslau) was a major Nazi-era German city in Lower Silesia and shares the same wartime historical context that Gates explores through the Leśna investigation.
Poland
Gates' broader Polish investigations touch on Nazi occupation and wartime secrets across the country, making Poland a recurring backdrop for the same themes explored in the Leśna episode.
Normandy Beaches, France
The Normandy Beaches episode connects thematically as part of Gates' wider exploration of World War II history, the Allied campaign that directly pressured the desperate Nazi programs — like the Amerikabomber — investigated in Leśna.
Historical data sourced from Wikipedia