until 31 March:
open Monday to Saturday from 9am to 5pm
open Sunday 29 March from 9am to 1pm
from 1 April to the end of November:
open Monday to Saturday from 9am to 6pm and Sunday from 9am to 1pm
Exceptions:
Easter weekend:
Good Friday, 3 April, from 10:00 to 13:00 and from 14:00 to 17:00; Saturday, 4 April, from 9:00 to 18:00; Easter Sunday and Monday (5 and 6 April) from 9:00 to 13:00
Public holidays: 9 a.m. to 1 p.m. (1 May, 8 May, 14 May, 25 May, 14 July, 15 August, 1 November, 11 November)
The city wall tower built in 1372, also known as the Kessler Tower, is the highest of the city's defence towers at 22 metres high. The original gateway to the tower is located high up and was only accessible by ladder, which could be removed to protect the tower from attackers.
On the wall of the tower there is a memorial plaque in memory of the 20 internees who awaited deportation during the Nazi occupation. The tower was also used to imprison dozens of people during violent demonstrations in 1943, awaiting their tragic fate.
Today, the Kessler Tower has fewer adventures, except for the comings and goings of the storks to their nest on the roof peak.