 Both Healy Hall and the Georgetown University Astronomical Observatory, built in 1844, are listed on the National Register of Historic Places.In front of the Healy and Copley Hall buildings is the large front lawn area, which is crossed by walkways and paths that center on the statue of John Carroll.In addition to the front lawn, the main campus has traditionally centered on Dahlgren Quadrangle behind Healy Hall, which is home to Dahlgren Chapel; however, in recent decades, Red Square has replaced the Dahlgren Quadrangle as the focus of student life.