Work on the 1 mile breakwater was started in 1811 and took almost 30 years to complete.
It transformed Plymouth Sound into safe anchorage, providing protection from the savage winter storms which regularly sweep up the English Channel from the Atlantic Ocean.
But clearly not needed on this beautifully calm summer morning
Looking out from the Devonport Column,
down onto the River Tamar where it flows into Plymouth Sound.
The 40 metre high mast, on the green hill of Mount Wise,
marks the spot on which was built The Mount Wise Redoubt ,
the guns of which could control all movement in and out of the River.
The grey, military-looking complex, just beyond the Redoubt, is The Royal William Yard ,
once the main victualling depot for the Royal Navy now redeveloped as a complex of apartments, restaurants, bars and boutiques.
Just beyond the Royal William Yard, in The Sound, is Drake's Island , which is just off Plymouth Hoe.