The Wawel castle functioned as the residence of the Polish rulers from the mid-11th to the early 17th century. The present structure incorporates Romanesque fragments and considerable Gothic parts, but it acquired its present form mainly in the period c. 1504-1535, during the reign of the kings Alexander (1501-1506) and Sigismund I the Old (1506-1548) of the Jagiellonian dynasty. Wawel Hill is accessible to visitors daily, from April to September: 6.00 a.m.-8.00 p.m., and from October to March: 6.00 a.m.-5.00 p.m.