The Theatre of Marcellus is an ancient Roman theatre between the Capitoline Hill and the Tiber. Begun under Julius Caesar and completed under Augustus in the late first century BC, it was dedicated to Augustus’s nephew Marcellus, who died young. Its semicircular façade recalls the Colosseum, which was built later, and its tiers of Doric and Ionic arches became an influential model for Roman architecture.
What makes the Theatre of Marcellus especially compelling is the history built into its walls. Medieval noble families fortified the ancient structure, and a Renaissance palazzo was later built above it; private apartments still occupy the upper levels. Nearby stand the columns of the Temple of Apollo Sosianus and the remains of the Portico of Octavia, adding to the sense of Rome as a city layered on its own past.
Most visitors admire the monument from outside, so allow around 20 to 30 minutes and combine it with a walk through the nearby Jewish Ghetto or a visit to the Capitoline Museums. Interior access is limited and the upper residences are private; check locally for any special openings or concerts. Wear comfortable shoes for uneven paving, and bring water in summer, when shade is scarce.