St. Mary's Basilica (Kościól Mariacki)

Worth it if you're into Gothic architecture and don't mind paying entry to a working church—the 4.9 rating from over 5,000 reviews suggests people genuinely rate the experience. Skip the pricey guided tours unless you want proper historical context; the basilica itself speaks volumes, and you can absorb it solo or with a mate for a fraction of the cost.

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