Constructed as a tower house in the late 14th century, Crichton Castle was expanded as power of the Crichton family grew. However, the Crichtons fell from favour in the later 15th century, and the castle passed to the Earls of Bothwell. Francis Stewart, 5th Earl of Bothwell, constructed the Italianate north range in the 1580s, featuring an elaborate diamond-patterned facade. After Bothwell was accused of witchcraft the castle fell into neglect. The ruins are now in the care of Historic Environment Scotland, and are open to the public. A mile to the south-west is Borthwick Castle, a 15th-century tower house that is still in use.
The castle's most distinctive feature is its Italian-influenced courtyard façade, which forms part of the north range. Francis Stewart, the designer, had travelled to Italy, and was inspired by new styles and technology in buildings there, particularly the Palazzo dei Diamanti in Ferrara (c. 1582). This was the source of the diamond rustication on the courtyard wall. The initials of Francis and his wife Margaret Douglas appear on the walls, together with an anchor representing Stewart's position of Lord High Admiral of Scotland. Inside are further innovations: Scotland's first 'scale-and-platt' stair, i.e. a modern-style staircase with landings and a drawing room to the north of the old tower.
To the south of the castle is a large stable block, with a horseshoe-shaped window and lodgings above.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.