The castle was besieged by Oliver Cromwell's army in 1660, suffered land and sea bombardment, and was left in ruins following it's surrender by the defending garrison. The Castle was restored in the late 1660's and continued to be manned by a garrison of around 20 soldiers. The Castle again became a prison during the wars with France between 1759 and 1815. In 1870 it became the central ammunition depot for Scotland until 1912 when it was scheduled as an ancient monument. The castle is now in good condition following a major rebuilding program between 1926 and 1935.
Blackness Castle is open all year round but is closed on Thursday afternoons and all day Friday during in the winter months. Opening times vary so check before travelling.