The Röderturm is the 14th-century tower over the Rödertor, the easternmost gate of the circuit, and for centuries it was the town’s signal post — the place a watchman stood to see trouble coming up the road. It is the only tower on the wall open to climb, and it is 103 steps to the tower room at the top.
On the floors in between there is an exhibition on how the town and its defences grew — and, more to the point, the Alt-Rothenburg society’s documentation of the destruction of 1945. That association helped rebuild this tower after it was burnt out to the bare walls at the end of the war, so the room you are standing in is itself the exhibit. On 31 March 1945 nine tons of bombs took 306 houses, nine towers and close to a thousand metres of wall — about 40% of the inner town — and the quarter you look down on from the top is exactly the ground that burned.
That is the case for coming here rather than only doing the Rathaus tower. The Rathaus tower is higher, in the middle of town, and shows you the plan. This one is small, cheap, on the eastern edge, and shows you the wound and the repair from directly above it.
The catch is the timetable. It opens 11:00–14:00 and no longer: daily in June, July and August; weekends and public holidays only in April, May, September and October; and from November to March the tourism office lists it as weather-dependent, which means you should assume it is shut unless you have checked. €3.00 for an adult, €1.50 up to 18.