try find some small religious building (church, mosque, whatever's most important to the place) thats still in use and have an explore. so much cool history and interesting art expression on a closer scale than insane cathedrals or other proper Sightseeing destinations. (no knock to those though, big up the sagrada familia 💪)
sometimes they'll have little information booklets or a leaflet, and theres just something really sick about checking out a place that's stuck around for so long with so much continuity.