The Vatican’s Gallery of Maps—a 400-foot-long corridor adorned with painted maps of Italy from the sixteenth century—will reopen on Saturday, April 30, following a four-year restoration. Commissioned by Pope Gregory XIII, the frescoed maps had started separating from the walls and were cracked and scratched prior to the overhaul. The damage was due in part to the large number of visitors who pass through the gallery on their way to the Sistine Chapel.