What country located within the city of Rome,is hime to a flight of steps built by Antonio da Sangallo the Younger in the early 16th century?
Scala Regia (Vatican):  It was built by Antonio da Sangallo the Younger in the early 16th century, to connect the Apostolic Palace to St. Peter's Basilica, and restored by Gian Lorenzo Bernini from 1663 to 1666. Vatican City: Vatican City ( ; Italian: "Città del Vaticano" ] ; Latin: "Civitas Vaticana" ), officially Vatican City State or the State of Vatican City (Italian: "Stato della Città del Vaticano" ; Latin: "Status Civitatis Vaticanae" ), is a country located within the city of Rome.
Vatican City