The District of Columbia Court of Appeals is the highest court of the District of Columbia. Established in 1970, it is equivalent to a state supreme court, except that its authority is derived from the United States Congress rather than from the inherent sovereignty of the states. The court is located in the former District of Columbia City Hall building at Judiciary Square. The building was built in 1820 The designer of the building was George Hadfield, who had supervised construction of the United States Capitol from October 1795 to May 1798. In 1868, a statue of 16th President Abraham Lincoln sculpted by Lot Flannery was erected on the south side of the building, which became the first public monument in his honor. That was just three years after Lincoln was assassinated. (Source: Wikipedia)