Rome, Italy. Theatre of Marcellus, completed 13 BC. Demonstrates arcuated Roman construction, with each round arch surrounded by an entablature frame. (Top floor was removed and redesigned during the Middle Ages.)
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Rome, Italy. The Colosseum, completed 80 AD, revealing the key Roman form of round arch set inside an entablature frame.
Pompeii, Italy. Example of original Roman brick, labeled as such even today for its distinctive long, thin shape. The Romans spread their brickmaking skills throughout the Roman Empire.
Rome, Italy. The Pantheon, completed in its current form around 126 AD. With its Greek-style pediment in front and its circular rotunda on the interior, this is perhaps the most influential and oft-copied structure in Western history.
Rome, Italy. The Pantheon, interior rotunda. The oculus (opening) at the top provides the only significant light inside. The weight of the concrete dome is lightened with the five rows of coffers (sunken squares). The dome is a perfect half hemisphere, and if replicated on the bottom half would just touch the original floor when creating a full sphere.