Ave Roma Immortails, Volume 2 by F. Marion Crawford

Borgo, the 'Suburb,' is the last of the fourteen Regions, and is one of the largest and most important of all, for within its limits stand Saint Peter's, the Vatican, and the Mausoleum of Hadrian -- the biggest church, the biggest palace and the biggest tomb in the whole world.

To those who know something of Rome's great drama, the Castle of Sant' Angelo is the most impressive of all her monuments. Like the Colosseum, it stands out in its round strength alone, sun-gilt and shadowy brown against the profound sky. Like the great Amphitheatre, it has been buffeted in the storms of ages and is war-worn without, to the highest reach of a mounted man, and dinted above that by every missile invented in twelve hundred years, from the slinger's pebble or leaden bullet to the cannon ball of the French artillery. Like the Colosseum, it is the crestless trunk of its former self. But it has life in it still, whereas the Colosseum died to a ruin when Urban the Eighth showed his successor how to tear down the outer wall and build a vast palace with a hundredth part of the great theatre.