Why go
Stand beneath the oculus and watch daylight move across the coffered dome, then turn toward the classical portico to see how two architectural forms meet. The single circular hall makes the Roman building unusually easy to read, while its later life as a church adds another layer to the visit.
What to look for
- Coffered concrete dome.
- Central oculus.
Useful to know
- Check current admission and service notices before entering.
Your next visit
Estimated · Declared scenario and planning estimates; no live opening, weather, queue or booking service.
Outdoor visit · 10–15 min
Public-space walk and exterior observation only; no interior, garden, tower or ticketed admission included. Durations and walking are estimates. Check temporary restrictions and park or market opening times.
Outdoor visit · 20–40 min
World planning estimate; admission, opening, visit duration and access need checking.