Royston Parish Church is taking part in the nationwide Heritage Open Days scheme to celebrate its 900-year history.
The Church of St John the Baptist, the largest Grade I* listed building in the town, will open its doors from 10am to 4pm on Saturday, September 14.
Visitors can enjoy free guided tours, try their hand at playing the organ, take part in a children's trail and view demonstrations of bell-ringing.
During the day, visitors can learn the stories behind the dragon, knight, angels and Green Men in the church.
They can also learn about the life of the monks in the days of the priory, discover the stories of some of the people who worshipped at the church in the 1100s, and see how the church building was restored following a devastating fire in 2018.
The church will be serving tea and selling handmade produce and souvenirs on the day.
Younger visitors can take part in a children's trail or try their hand at hook-a-duck or winning chocolate in the tombola.
The parish church is situated near the intersection of two historic routes: Ermine Street and the Icknield Way.
Over the centuries, people ranging from Kings to highwaymen have passed through Royston, and many have visited and received the hospitality of the priory and church.
A spokesperson for Royston Parish Church said: "Follow in their footsteps and find out more about its heritage and experience how the tradition of welcome and hospitality continues today."
All are welcome to attend the open day and there is no need to book in advance.
Royston Museum is also opening under the Heritage Open Days scheme.
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On Saturdays and Sundays from September 6 to 15 the museum is offering the chance to get up close to objects from the past and make fun crafts to take home.
Visitors can join curator Sophie on Thursday, September 12 for a 30-minute pop-up talk about Royston's history.
More information is available on the Royston Museum website.
Heritage Open Days is England's largest festival of history and culture, which runs for 10 days every September across the country.
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