Domus Aurea entranceNero's buried palace, seen on a guided walk through the excavated rooms with a virtual reality reconstruction. Hard hats provided, and the tunnels are cool and uneven.
Explora - Il Museo dei Bambini di RomaHands-on children's museum with a supermarket, a fire engine and water play. Entry is in timed sessions, so book ahead. Free under 1.
National Gallery of Modern and Contemporary ArtModern art collection next to Villa Borghese, with family workshops for 14+ and a garden cafe. Free under 18.