[Mach9]

The remains of a wall certainly exist; but there are countless unobstructed, unguarded accesses. Directly in front of St. Peter’s are at least two large thoroughfares into the tiny city, not to mention the city’s multi-level underground parking lots. The queue shown in your photo is for entry to the Vatican Museum, not “the Vatican” or Vatican City. Most of the city is car-free (except for inhabitants’), but so are streets in the historic, and often walled, portions of just about every city in Italy, many of which (like Lucca) are more securely walled.

[Steve_Seattle]

"The remains of a wall certainly exist."

Those are mighty impressive-looking "remains." Yes, the public has access to St. Peter's Square, St. Peter's Basilica, and a few museums and shops, just as foreigners have access to American tourist attractions, but most of the city is off-limits to the general public.

And it is out of the question for a non-citizen to just walk in and set up residence within the city limits.