Walking Around the 228 Peace Memorial Park in Taipei
caused controversy. If you're interested in what the gates looked like before the KMT rebuilt them, look no further:
The park is open all the time, and the museum (which I didn't visit) is open from 10-5 Tuesday through Sunday. Admission to the museum is NT$20. The gate is viewable anytime, though you can't go inside and I wouldn't recommend trying to cross that roundabout! NTU Hospital Station is right next to the park on the MRT, The Kai-sheik Memorial Hall complex is a short walk west from the park.