The event covers the whole of Lanarkshire, from Cumbernauld and Kilsyth in the north to Biggar and Leadhills in the south, and forms part of a larger Scotland Doors Open Day programme which is taking place throughout September.
Buildings participating in this years event include some family favourites - Lanarkshire firestations to more unusual venues including the Bartlett potato factory. There are some venues which can only accommodate pre-booked tours so make sure you check for details.
Many of the buildings are also hosting activities and events.