The Basilica of Maxentius (308-312 AD) was the largest building in the Forum. 100m long, 65m wide, the central nave 35m high — covered by THREE concrete barrel vaults that were the largest unsupported spans ever built. Only the north aisle survives: three coffered barrel vaults, each 20m high, that DWARF everything around them. When you stand beneath them, you understand Roman engineering not as a concept but as a WEIGHT pressing above your head. Bramante studied these vaults before designing St. Peter's Basilica. The Vatican's nave is a direct descendant of these arches. The last great Roman building. The prototype for the greatest Christian building.
The three surviving vaults: Coffered concrete barrel vaults — the coffers (octagonal recesses in the ceiling) both reduce weight and create visual rhythm. Originally, the central nave was even larger — three cross-vaults 35m high, supported by 8 Corinthian columns (one survives, moved to Piazza Santa Maria Maggiore by Pope Paul V in 1613). The marble floors, stucco decoration, and gilded coffers are gone. What remains is the STRUCTURE — raw concrete and brick, the skeleton of a building that was once Rome's most magnificent interior.
The colossal statue of Constantine: The apse originally held a 12-meter seated statue of Constantine (Maxentius started the basilica, Constantine finished it after winning at the Milvian Bridge). Fragments survive in the Palazzo dei Conservatori courtyard (Capitoline Museums): the head alone is 2.6m tall. The foot is 2m long. Standing next to the foot gives you the scale of what sat in THIS building.
Via Sacra, Roman Forum. Included in Forum/Palatine/Colosseum ticket (€16). Most visitors walk PAST it on the Via Sacra without looking up. Stop. Stand under the north aisle. Look at the coffered ceiling 20m above you. This is the ceiling that Bramante looked at before drawing St. Peter's. Summer concerts: The basilica occasionally hosts evening concerts — the acoustics under the vaults are extraordinary. Check museiincomuneroma.it. Forum → · Day 1 →