Threave Castle is a striking 30-meter-tall island fortress on the River Dee near Castle Douglas, built by Archibald 'the Grim' in 1369 as a stronghold for the Black Douglases. This medieval power base features innovative artillery fortifications and stands on an island accessible by boat, surrounded by summer wildflowers and wildlife including ospreys and otters. Visitors explore the surrounding island while the castle interior undergoes conservation work, with nearby access to the National Trust for Scotland's Threave Garden and Nature Reserve offering additional attractions.
