This small, two-storey Renaissance-style castle is an early 17th century reconstruction of a 13th-century fortress built by Henrick Dornberg. Named after its owner Ivan Marija Coronini, who in 1609 acquired the title 'von Cronberg', it is a typical Renaissance building with a square ground plan and corner towers. The interior was designed by architect Janez Suhadolc. The castle was severely damaged in both World Wars, but was renovated on both occasions.
Since 1954 Kromberk Castle has accommodated the Goriška Museum with its rich collection of paintings, cultural and historical collection, and rooms for occasional exhibitions.
A terraced garden around the manor has been partly reconstructed in accordance with data about its state in the 18th century.