One of the town's best-known landmarks, the Custom House has overlooked King's Lynn's historic quays for centuries.
Designed by Sir Henry Bell, it was built in 1683 to house customs officers keeping their eye on Lynn's bustling waterfront.
Merchants originally traded from its ground floor, but they decamped claiming the Custom Housse was too far from the Tuesday Market Place - a short walk down King Street.
Architect Sir Nicholaus Pevsner, who wrote The Buildings of England, called it one of the most perfect buildings ever built.
Nowadays, the Custom House is home to west Norfolk's main tourist information centre, while its upper floors host exhibitions.
Its first floor windows offer a stunning view of Purfleet Quay, with its statue of the 18th Century explorer Capt George Vancouver, who came from Lynn.
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