Pantheon
A 1,900-year-old concrete dome with a hole punched in the top — when it rains in Rome, it rains inside too.
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Hadrian's builders (c. AD 126) poured a dome 43.3 m across — still the world's largest unreinforced concrete dome. Its diameter exactly equals its height, so a 43.3 m sphere would fit inside. Raphael is buried here, alongside Italy's first two kings.
What to look for
- The portico inscription M·AGRIPPA·L·F·COS·TERTIVM·FECIT still credits Agrippa, though Hadrian rebuilt the whole structure over a century later
- Drainage holes set into the sloped marble floor below the open oculus — rain falls straight through and runs off
- The 140 sunken coffers in five rings of 28 — an evenly spaced grid that may once have held bronze rosettes symbolising the starry firmament
Still a working church — the Basilica of St. Mary and the Martyrs (Santa Maria ad Martyres), since 609 — so come on a rainy day to watch water pour through the oculus onto the floor drains.
Pantheon is one of 40 sights worth the detour in Rome, all bundled offline in Voyage GO — download the Rome pack and it sits on your map with no signal, filling your travel passport the moment you walk past.
More to see in Rome
- Vatican CityThe world's smallest sovereign state fits in 44 hectares — you cross its border by stepping over a white line.
- ColosseumAround 50,000 Romans packed this stone oval to watch spectacles staged over a two-level warren of cages beneath the arena floor.
- St. Peter's BasilicaThe world's largest church, built directly over the grave believed to hold St. Peter's bones.
- Sistine ChapelMichelangelo painted the ceiling standing up, not on his back — and cardinals still elect the pope in this room.
- Stadio OlimpicoOne 70,634-seat bowl, two cross-town tenants: AS Roma and SS Lazio both play here.
- Roman ForumThe valley where Rome held elections, tried criminals, and paraded victorious generals down the Via Sacra.