Italy.

The Pantheon offers a compact encounter with Roman construction and later church history in central Rome, with a remarkable dome visible from a single interior space.

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.

• Coffered concrete dome.
• Central oculus.

Check current admission and service notices before entering.