Mladá Boleslav Castle, originally built in the first half of the 14th century, has gone through many development stages. Despite the Renaissance castle and the period of devastation after the Thirty Years' War, the army took over the building for 200 years and converted it into a barracks. Between 1940 and 1943, Jews from the wider Boleslav area were interned here. Today it is the seat of the Museum of Mladá Boleslav and Archive.
The castle was used as a seat of castle wardens and later clerks serving the nobility and the nobility itself.
After the Thirty Years’ War, the castle became the property of the town and decayed significantly. In the mid-18th century, the entire building was reconstructed to serve as army barracks and was used by the army until 1953. After this, the castle served as a textile warehouse until 1972.
The Museum of the Mladá Boleslav region currently operates in the castle.
The Broch of Gurness is an Iron Age broch village. Settlement here began sometime between 500 and 200 BC. At the centre of the settlement is a stone tower or broch, which once probably reached a height of around 10 metres. Its interior is divided into sections by upright slabs. The tower features two skins of drystone walls, with stone-floored galleries in between. These are accessed by steps. Stone ledges suggest that there was once an upper storey with a timber floor. The roof would have been thatched, surrounded by a wall walk linked by stairs to the ground floor. The broch features two hearths and a subterranean stone cistern with steps leading down into it. It is thought to have some religious significance, relating to an Iron Age cult of the underground.
The remains of the central tower are up to 3.6 metres high, and the stone walls are up to 4.1 metres thick.