We went to the Washington DC Temple today. They have a nice visitor's center that has a cut-away model of the temple.
Temple exhibit about temples throughout time, this one being the Old Testament tabernacle.
King Solomon's Temple
Kirtland Temple, in Ohio, built in 1833
They just renovated the visitor's center and added lots of new exhibits, this one being for kids.
Color your own temple
the kids were sitting in front of a monitor that had primary songs playing for a sing-a-long
you could move this big screen over different pictures to see different stories of church members
you can have your picture taken as a family in front of a temple mural and they print it out and email it to you
That exhibit in the background is all about missionary experiences. The temple was beautiful and we look forward to attending.