First I've heard of this: "A Citywide Celebration of Living Landmarks March 7 – 22, 2009"
Even Meadow Nook, the Alston House at East Lake will be open.
Wow. I need to study so I can see as many of these as possible. More later.
If you do the downtown or courthouse tour, you may find this giant feather (from Besharat Gallery) on Broad Street, next to the Grant Building.