Mainzer Straße, 55413 Rheindiebach
This was connected with the Fürstenberg castle complex on the Rhine Heights via Rheindiebach. Today, the round tower is located between Mainzer Straße and the B9 federal road. It was reduced in size by half - i.e. halved - in 1969 when the federal road was extended. The "half fortified tower" is owned by the municipality and is accessible via a spiral staircase. For the public, the round tower can only be visited from the outside.