This is one of the last few remaining parts of the 3rd Century Baths of Diocletian. For many years this was Rome's Planetarium and is now a tiny but truly delightful Roman Sculpture Gallery. It will only take 20 minutes of your time and is breathtaking. Free admission but it's not always open.
Viale E. di Nicola (Near Termini Station at the top of the Via Nazionale - next door to Michelangelo's Church of Santa Maria degli Angeli.
Send your feedback or queries to been.there@guardian.co.uk
Search Been there