The imposing red sandstone ruins of Bothwell Castle guard a strategic crossing point over the River Clyde. One feature is the castle's unusual round keep, or donjon. You can also explore the prison cells, great hall and chapel. Construction was started on the castle in the late 13th century, but was incomplete when captured by the English, recaptured, captured again... It then changed hands several more times and had a chequered history, being intentionally ruined at least twice so that it could no longer be used.
The castle sometimes has to be closed at short notice due to bad weather. Check with Historic Scotland before making a special trip.