Welfenkaserne, Military complex in Landsberg am Lech, Germany.

Welfenkaserne is a military complex in Landsberg am Lech comprising multiple buildings and administrative areas for the German armed forces. The grounds include an underground facility that serves operational and maintenance functions for the armed services.

On 21 April 1944 Hitler ordered six bomb-proof underground aircraft factories; three were planned at Landsberg, including Weingut II, built under Organisation Todt supervision. From June 1944 to April 1945 around 23,000 prisoners from the Kaufering subcamps of Dachau were deported to Landsberg for the work; 6,334 deaths are documented. At war's end 226 metres of the outer shell were concreted and the first 70 metres partly fitted out.

Today military personnel and civilian employees work on the grounds while a memorial honors those who died during its construction. The site visibly carries the marks of this difficult past.

The site functions today as an active military facility with limited public access to most areas. Visitors should inquire beforehand about accessible sections and any required permissions.

The underground tunnels extend approximately 226 meters and were originally designed for aircraft production. Today these spaces serve entirely different purposes yet still show traces of their original industrial scale and construction.