One of the oldest active courthouses in the U.S. has reopened for public visitation. The New Castle Court House Museum closed in December for the installation of a fire sprinkler system throughout the historic building. Built in 1732, the Court House and was Delawareโs first capitol and it was here that New Castle, Kent and Sussex Counties declared their independence from Pennsylvania and England and thereby creating the Delaware State. Located at 211 Delaware Street in Historic New Castle, the Court House Museum is a partner site in the First State National Park. Admission is free and hours are Wed-Sat (10am-4pm) and Sun. (1:30-4:30pm). Tours run hourly. Visitย History.Delaware.gov.