Directly at Checkpoint Charlie is Berlin's Trabi Museum, dedicated to the history of the famous car with the two-stroke engine. Serial production of the Trabant started in Zwickau in 1958 and it is definitely the most famous car from East Germany.
The Wall Museum - Museum Haus on Checkpoint Charlie was established and opened as a civil commitment initiative immediately after the wall was built in 1962.
The citadel is one of the best preserved fortresses of the Renaissance. The original fortress along with the Julius tower, the oldest structure in Berlin, was built around 1200.