The Monastery Church on Lange Voorhout is a historic monument from 1403 with ties to the House of Orange. Once used as a hospital and cannon foundry, it is now a Protestant church and cultural venue. Notable are the stained glass windows, the mosaic of the Last Supper, and the graves of figures like Jacob Cats. The church continues to thrive as a center for art, culture, and faith in the heart of The Hague.