St. Paul’s Church. It is a beautiful church, with a number of top paintings, e.g. by Rubens, Van Dyck, Jordaens. But also the woodwork is really pretty, the carvings are so detailled… Last WE I went there to take some pictures, mainly of the statues.
You can visit the church during the WE, in the afternoon. It is free, but a donation is appreciated. And there are a lot of volunteers to give you some more inside information.
In the Wikipedia page one anecdote is missing: the church is located next to the red light district and during the fire 1968, the paintings were saved from destruction by people from the neighbourhood, including the ladies working in the red light district…