The Cathedral of the Assumption is a red-brick neo-Gothic basilica completed in 1905, with twin spires that are the tallest landmark on the central skyline. The small white baroque "old church" — built by the Branickis in 1626 — clings to its eastern wall, a strange and rather moving sight if you walk around to look.
Inside the new church is light, lofty, and decorated in a restrained late-19th-century style; the old church, much smaller, has the original family memorials. The two together are worth a short stop. Open daily outside Mass times.