Vicus Caprarius - The Water City

Located over nine meters beneath the Trevi neighborhood, Vicus Caprarius—known as the 'City of Water'—is an underground archaeological site featuring excavated ancient Roman domus remains and masonry walls. Visitors walk along metal catwalks above illuminated cisterns and water systems where the original Aqua Virgo aqueduct still flows directly toward the Trevi Fountain. It is widely showcased as a remarkable subterranean hidden gem and a cool escape directly below busy city streets.

Commenters are largely fascinated by the ancient, functional Roman engineering and frequently praise it as an atmospheric hidden gem. While tickets are widely considered affordable at around 4 euros, visitor sentiment is somewhat divided, with a few finding the compact site a bit underwhelming or lacking in extensive content. Many travelers also express regret over missing it during past trips and inquire about reservation methods.