Severndroog Castle is a folly situated in Oxleas Wood, on Shooter’s Hill in south-east London in the Royal Borough of Greenwich. It was designed by architect Richard Jupp, with the first stone laid on 2 April 1784.
It was built to commemorate Commodore Sir William James who, in April 1755, attacked and destroyed the island fortress of Suvarnadurg (then rendered in English: Severndroog) of the Maratha Empire on the western coast of India, between Mumbai and Goa. James died in 1783 and the castle was built as a memorial to him by his widow, Lady James of Eltham.
Designated a Grade II* listed building in 1954, the Gothic-style castle is 63 feet (19 m) high and triangular in section, with a hexagonal turret at each corner. From its elevated position, it offers views across London, with features in seven different counties visible on a clear day.