1.   Masonry walls have a lot more kinds of cracking, and some can require a structural repair.

2.   The walls had political slogans daubed on them.

3.   A wall had to be demolished, and patients on these wards could not be subjected to the unavoidable dust and noise which would result.

4.   The Holstentor, which is still the town gateway though the walls have partly disappeared, is now fully restored.

5.   Inside the brick walls have niches, originally with mosaic covering.

6.   Each wall has a different theme.

7.   The high grey wall has a lip trimmed with razor wire.

8.   At another stop, they visited several buildings on Fulton Avenue that had been so far gone, the rear walls had had to be replaced.