Recent projects completed with 100% single room provision include Migdale Hospital in Bonar Bridge and the Royal Victoria building in Edinburgh.

BBC: 'Progress made' on Scottish hospital rooms

Booking a room at the 400-room Royal Sonesta guarantees exceptional views of the Charles Bridge, which separates Boston from the city of Cambridge where notable universities like Harvard and the Massachusetts Institute of Technology are located.

BBC: Business trip: Boston

In addition to the gun salute from the Royal Citadel, a lone piper played on the bridge as HMS Montrose entered the naval base.

BBC: HMS Montrose returns after south Atlantic deployment

The widow of a policeman who died when a Cumbria bridge collapsed during flooding has met the Princess Royal.

BBC: PC Bill Barker's widow meets Princess Royal

In 1940 Donald Bailey of Britain's Royal Engineers used his Erector Set to design the portable Bailey Bridge, which spanned creeks and rivers and was hailed by Eisenhower as one of the three most important technological advancements of the war, along with radar and heavy bombers.

FORBES: Boy Toy