This site is one of the great Roman ruins in the city that help modern day visitors get a sense for the scale and quality of architecture during the Roman empire. So well built was the complex that Renaissance popes redeveloped it as a magnificent Capuchin monastery under the direction of Michelangelo. The museum is filled with very good quality Roman and Greek sculpture, along with a wide variety of grave markers and sarcophagi from the Roman empire. You get a lot of history within a short two-hour visit.
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