Passetto di Borgo, the pope's secret Vatican City passage.
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Holy Door by Vico Consorti at the Ferdinando Marinelli Artistic Foundry during its construction The Holy Door by Vico Consorti, cast by Ferdinando Marinelli Artistic Foundry of Florence, is the northernmost entrance of Saint Peter's Basilica in the Vatican. It is cemented shut and only opened for Jubilee Years.
St. Peter's - The Holy Door. The Holy Door or 'Porta Sancta' is only open during a Holy Year (Jubilee), which occur every 25 years (the last one in 2000).
The Vatican City does not shut down after a certain time, or lock visitors out, so you are free to walk around the square at any time. However, it is worth noting that all the Vatican museums and St. Peter's Basilica will not be accessible after nightfall, and you may be disappointed by this.