More than 70 historical buildings and sites in and around King’s Lynn are inviting people through their doors for free on Sunday.
To celebrate Heritage Open Day, many buildings, towers and tunnels, which are often closed to the public, will be open to explore from 10am to 4pm.
The bumper list of venues has been organised by the town’s civic society.
These include Hampton Court Secret Garden, the historic South Gate and the pilot office at the Conservancy Board.
The town’s Minster is to hold a birds of prey display and the Second World War air raid shelter will be open beneath the Tuesday Market Place.
A miniature railway in The Walks is bound to attract youngsters and visitors can hop on and off a vintage bus which will stop off at some of the venues.
To coincide with Heritage Open Day, West Norfolk Council is holding its Classic Car Show.
More than 200 vintage, classic and iconic vehicles will be showcased at the Tuesday Market Place.
There will also be live music from the Kat Brittain Band, the Summertime Kings and The Carnaby Sounds.
Graham Middleton, West Norfolk Council cabinet member for business development, said: “There will be some amazing cars on display with Heritage Open Day taking place at the same time, it will be a wonderful day to visit King’s Lynn.”
At Hunstanton, for the first time, two venues are also set to open – the former infant school in James Street and the lighthouse.
Visitors will also have the opportunity to tour the lighthouse dungeon and climb the tower.
A guided walking tour of the grounds and courtyard of Old Hunstanton Hall is also available.
For the full Heritage Open Day programme visit www.kingslynncivicsociety.co.uk