The castle, originally built as a mausoleum for Emperor Hadrian, was used as a safe place for the popes, and there was a secret passage connecting it to the Vatican.
Passage connecting the Vatican with Castel San Angelo
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© Google Maps
By kjfitz @ 2007-01-03 10:37:25
FabFour
@ 2007-01-03 12:01:21
"Secret"? D'oh ;)