Private Underground Tour of the Trevi Fountain and Pantheon

Beneath the coin-tossing crowds of the Trevi Fountain lies a Rome most visitors never see — and on this private tour, you'll explore it with a guide dedicated entirely to your group.

Your experience begins at Vicus Caprarius – The City of Water, an archaeological site hidden just steps from the Trevi Fountain and discovered by accident in 1999 during renovation work on a cinema. Descend roughly 9 meters below street level to walk among the remains of a 2nd-century Roman residential complex, alongside a stretch of the Aqua Virgo — the same ancient aqueduct that, incredibly, still feeds the Trevi Fountain above your head today, nearly 2,000 years after it was built. Your private guide will bring this hidden layer of the city to life, from Roman domestic life to the aqueduct engineering that shaped the neighborhood you're standing in.

Back above ground, you'll continue on to the Pantheon, one of the best-preserved buildings from the ancient world and one of the greatest engineering achievements in human history. Originally built as a temple by Marcus Agrippa in 27 BC and completely rebuilt by Emperor Hadrian around 118–125 AD, the Pantheon is topped by the largest unreinforced concrete dome ever built — a record it still holds nearly 2,000 years later. At its center, the famous oculus — a 9-meter open circle at the dome's summit — is the building's only source of light, casting a shifting beam of sunlight across the marble interior throughout the day. Your guide will explain how Roman engineers pulled off this "impossible" dome, why the inscription on the façade is famously misleading, and how this pagan temple later became a Christian church — which is why it still stands intact today, while so many other ancient buildings were lost.

Because this is a private tour, the pace, questions, and route are entirely built around your group — no waiting on other travelers, no scripted stops.

On this tour, you'll:

Descend into the hidden underground ruins of Vicus Caprarius, reserved for guided visits only See the ancient aqueduct still supplying the Trevi Fountain today Stand beneath the Pantheon's record-breaking dome and its extraordinary oculus Learn how Roman concrete engineering achieved what no one would match for over a thousand years Enjoy a private, fully personalized guide dedicated only to your group