The same one as the lightning rod was on from last week's Fri. photo-blog.
Around the other side is the entry and full set of stone stairs until the very top when it becomes a tiny spiral staircase of steel.
It was renovated/retrofitted in 2002.
It's called Friedrichsturm
The looking up at the staircase
The steel stairs
A view from afar, note the man (half of him) at the top of the tower...