One hour tour, which was just right if you like taking photos of the printed descriptions in the archeological site to view later when relaxing (you can also stay behind after the tour to read them). Very informative guide (Francesca), fabulous with answering questions, on time and no problems! We thoroughly enjoyed seeing the history of Rome found underground in the archeological strata below this ancient city, and Francesca was a fantastic guide through it! Not too busy at all even in peak season! Definitely try this 1h tour!

It was a good size group - small enough to keep together. The Trevi Fountain part of the tour was difficult to hear even with head phones due to where we were standing and other tour groups. The remainder of the tour was good. The tour guide was good - informative and engaging. Several of the group thought, including my husband, that the tour would include going under the fountain based on the description.

This tour beneath modern Rome is like being invited on an archeological adventure that includes spelunking but one that--thankfully--requires absolutely no gear and you don't get dirty. Anestis led me through the archeological remains of there is a stretch of the Aqua Virgo aqueduct, inaugurated in 19 BC Rome, spotlighting the Aqua Virgo aqueduct, which still supplies water to the Trevi Fountain in the 21st century. Afterwards, he marvelously pointed out and described in detail features of the fountain that, though I had already seen it and just the night before had attended a tour that included the Trevi, had escaped my notice (or been ignored by the guide of the previous tour). Finally and thrillingly, he told me the two locations where I could find the extant and functioning Aqua Virgo aqueduct, giving me an opportunity to have my own archaeological adventure. No digging out dirt required.