The Heathens' Wall is Wiesbaden's oldest structure from Roman times and is found next to the Roman Gateway. Only fragments of the wall, which in fact was part of a Roman stronghold dating back to 364-375 AD to ward off attacks from the Germanic tribes, remain today.

The Roman Gate was built in 1902 with a covered wooden bridge. In the Roman Open-Air Museum next to the Roman Gate, there are copies of stone tablets found in Wiesbaden from the Roman era.

A small open-air museum shows copies of Roman stone tablets.