Admission with Multiple Buildings

We have 3 buildings on our campus that have ticketed experiences guest can get into. One ticket can get them into all 3 buildings. Does anyone else have a similar system at their museum? If so, how do you track attendance? Do you track attendance at all locations? We would like to be able to scan a barcode at each location to track visitation for each building, see how folks are spending time on our campus, what combination of buildings are they visiting, etc. Anyone have similar processes?