The former Cornelius tower - dating back to the 14th century - was part of the old city fortifications. It was transformed into the Zimmertoren (Zimmer Tower) in 1930. Clockmaker and astronomer Louis Zimmer donated the Jubilee Clock to the town of Lier in honour of Belgium's 100th anniversary.

The Jubilee Clock on the front of the tower captivates everyone who pays a visit. The clock shows time indications on all continents, phases of the moon, times of tides and many other periodic phenomena.

Nowadays the Zimmertoren is without a doubt the most famous landmark in Lier.