Portland stone is a limestone quarried on the Isle of Portland, Dorset.
It has been used for a variety of national prestigious projects (Buckingham Palace, Palace of Westminster, Bank of England, Tower of London) and also for many surviving local major works.
Local examples (click to enlarge)
Old Sessions House, Longport
Former prison entrance, Longport
Old Post Office, 28 High Street
St John's Primary school, near Sainsbury's at Kingsmead