Royal Citadel stands on the eastern edge of Plymouth’s waterfront, a fortress built to defend the port from naval attack. Constructed in the 17th century, the castle occupies a commanding position overlooking the Sound and the surrounding coastline. Its walls, bastions and military architecture remain largely intact, offering visitors a rare insight into Stuart-era coastal defence and the strategic importance of Plymouth’s harbour.
The site continues to function as an army base, maintaining its original purpose as a military installation. The fortress can be explored on guided tours, which reveal the underground passages, barracks, and gun emplacements that once guarded England’s shores. Its blend of historical significance and active military use makes Royal Citadel a distinctive landmark in Plymouth’s landscape, distinct from the city’s other heritage attractions and easily accessible by foot from the city centre.