The building was designed by Cass Gilbert who modeled it after the St Peter's Basilica in Rome. It is the second largest unsupported marble dome in the world, only St Peter's is larger. A guilded quadriga called The Progress of the State adorns the roof over the south entrance. It was sculpted by Daniel Chester French and Edward Clark Potter in 1906. Currently the capital dome is going through restorations.
You can also find the Minnesota Supreme Court Building as well as several other government buildings surrounding the capital courtyard in St Paul.