Part of the MACRO Museum with its main building in North Center in a complex that was used as slaughterhouse in the 19th century.
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Mercato Testaccio
Great place to see the wide range of fresh produce available in Italy. Fish and flower stalls as well. Stock up here for picnics to sustain you while sightseeing.
Cimitero Acattolico
Behind the pyramid, entered by the Via Caio Cestio, is the Protestant Cemetery where the poet John Keats was buried in 1821 and Percy Bysshe Shelley's ashes were also buried after his drowning in 1822. Richard Dana, author of Two Years before the Mast was buried there in 1882, and the Beat Generation poet Gregory Corso was buried there in 2001.
A tomb for the wealthy Gaius Cestius, who died in 12 BC. Admission to the monument only by guided tours on specific dates (2nd and 4th Saturday every month, and in combination with a ticket to the Museum of Via Ostiense also on the 1st and 3rd Saturday of every month).
Small collection of railway carriages and related stuff. Really just for those with special interest in the topic. Entrance through the station if the main entrance is closed.
Next door to the Pyramid, this fine gate in the Aurelian Wall is named after St. Paul as the Via Ostiense leads to the basilica of St. Paul's Outside the Walls (see Rome/South).
Home of the Abbot Primate of the Benedictine Confederation and Benedictine monks studying in Rome. Visit the monastic produce shop and listen to the best Gregorian chant in Rome during Vespers (19:15 each evening).