The Heritage Open Days are a chance to look around places not normally accessible to the public.
*One of those places is *The Curat House in Norwich. From the outside it looks like a modern day shop face, but inside it houses one of the city's many unseen undercrofts.
That's what Heritage Open Days are all about - getting to see places you might not even have known existed.
Beneath the magistrates courts in Norwich lies a 12th century house - preserved during building work in the 1970's
Other buildings opening their doors include the likes of the medieval Great Hospital - still used as a nursing home.
And there's a chance to see parts of the Maids Head hotel - without spending a penny.
"But the heritage open days aren't just all about old buildings. For example, how often do you get to sit in the Bishop of Norwich's garden for free?"
The bishop would approve that 31 of Norwich's 32 churches will be open too.
There are places open right across Norfolk including Thetford and Yarmouth. A chance to see some of our hidden heritage that is often right in front of our eyes.