Under Archbishop Friedrich III of Cologne (1370-1414), Rhens received a multi-towered town fortification at the end of the 14th century. Allegedly begun in 1396, the "very beautiful wall" is said to have been completed only under his successor Dietrich II in 1424. On the south side of its Rhine front stands the mighty "Scharfe Turm", a three-storey round tower with a lower wall thickness of more than three metres. Accessible via the city wall, a spiral staircase in the thickness of the wall leads from the middle storey to a privy, the remains of which have been preserved, and via the third storey to the defence platform. In 1904 and in the 1980s, the important building was thoroughly renovated and today houses a museum room of the Kaiser Ruprecht Bruderschaft zu Rhens e. V. and the "Türmerzimmer".

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