Johnstone Castle is a historic building located in Johnstone, a town in Renfrewshire, Scotland. Originally constructed in the 15th century, it has undergone various renovations and changes over the years. The castle features a mix of architectural styles, reflecting its long history and the different periods of construction. The castle is surrounded by beautiful gardens and parkland, making it a picturesque site. Although it is not open to the public for tours, its exterior can be admired from the surrounding area. Johnstone Castle remains an important landmark in the local community and a reminder of the region's rich heritage.