Take I-45 North to Huntsville (exit 118). This will be the last Huntsville exit. Turn right at the stop light, then make another right onto Hwy 75. You will pass the City of Huntsville Service Building on the left. The highway will intersect FM 2821; turn left onto FM2821. Turn left immediately into the Wynne Unit. The Windham Administration Building will be the first red brick building on the right.