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| Castel Sant'Angelo, Rome, Italy © Doug Hickok This ancient Roman mausoleum built in the 2nd century was eventually converted into a fortress for the Popes duting the 14th century, and for the longest time was Rome's tallest building. |
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| Castel Sant'Angelo, Rome, Italy © Doug Hickok This ancient Roman mausoleum built in the 2nd century was eventually converted into a fortress for the Popes duting the 14th century, and for the longest time was Rome's tallest building. |