The medieval fortress of Medvedgrad, just above the city on the southern side of Mt Medvednica, is Zagreb’s most important medieval monument. Built from 1249 to 1254, it was erected to protect the city from Tartar invasions. Today you can see the rebuilt thick walls and towers, a small chapel with frescoes and the Shrine of the Homeland , which pays homage to those who died for a free Croatia. On a clear day, it offers beautiful views of Zagreb and surrounds.
To get there, take bus 102 from Britanski Trg and get off at the church in Šestine; continue on foot following hiking trail #12 (from Lagvić to Medvedgrad).
