
When you are heading to the Vatican, you can’t avoid seeing an amazing ancient bridge (foot traffic only) decorated with angel sculptures, and a mighty, brown building of original architecture near it. The Castle of the Holy Angel in the center of Rome, Italy, started its history as a mausoleum of the Roman Emperor Hadrian in 139 AD. In 250 years, it became a castle when the young and rising power, the Christian Church, started to replace pagan Roman buildings with Christian ones.
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