The cathedral is perceived as a must-see place. No local will ever let you leave the city if she or he hasn't showed you the cathedral. Everyone is proud of this monument, and it really is a piece of art that shares many tales of old.
It tells a lot of stories from the city's past. The first story goes to 11th century, the times when this city was founded. One of those stories is one about the 1880 earthquake that destroyed Zagreb. That's when the cathedral got its current appearance. Just entering the cathedral, you will hear soft whispers from the past.
Walk around the cathedral, too. There's a sense that you shouldn't do that, but you can freely enter the small iron gate next to the church.