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Vatican Passport and Visas Information
With a little more than 100 acres (less than half a square kilometer) within its walls, the Vatican is easily traveled by foot; however, most of this area is inaccessible to tourists. The most popular areas open to tourists are the Basilica of St. Peter and the Vatican Museums.
If you're heading up Monte Mario, wear comfortable shoes�it's quite a climb!
Source: Wikitravel.org