Final answer:
The sight in Rome named after Pope Sixtus IV is the Sistine Chapel, the site of the Papal Conclave. Rome's transformation during the Renaissance, including the construction of Saint Peter's Basilica and St. Peter's Square, emphasized the city's role as the center of Christendom.
Step-by-step explanation:
The sight in Rome named after Pope Sixtus IV, who restored it, and is the site of the Papal Conclave is the Sistine Chapel. Pope Sixtus IV's renovation efforts during the Renaissance period have left an indelible mark on the Vatican City.
Not only is the Sistine Chapel known for Michelangelo's ceiling and The Last Judgment fresco, but also as the location where new popes are chosen. In addition to the Sistine Chapel, Saint Peter's Basilica serves as the heart of the Catholic Church and is a renowned site for pilgrimages and papal services. Constructed during the Renaissance, the basilica stands atop the earlier fourth-century church established by Constantine the Great.
Under the guidance of various popes, Rome was transformed into a city befitting the capital of Christendom, through the construction of grand avenues, monuments, and Renaissance architecture. These grandeur pathways reshaped Rome and highlighted its divine authority and religious significance.
Pope Alexander VII, for example, commissioned Bernini to construct the iconic St. Peter's Square, an architectural marvel that accommodated large gatherings for papal blessings.