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The mosaic apse of the Basilica of San Clemente in Rome was built in the 12th century, along with the present structure. The basilica has three levels of history. Beneath the present basilica is a fourth-century basilica. In the basement is a structure built in the first century. (U.S. Air Force photo/Staff Sgt. Andrew Lee)
24.0-70.0 mm f/2.8
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