A:
The best Underground Tours in Rome according to Viator travelers are:
- Expert Guided Tour of Colosseum Underground OR Arena and Forum
- Immersive Underground and Piazzas Tour in Rome
- Ancient Rome: Colosseum Underground Small-Group Tour
- Vatican Museums, Sistine Chapel & St Peter’s Basilica Guided Tour
- Skip-the-Line Group Tour of the Vatican, Sistine Chapel & St. Peter's Basilica