Fishbourne Roman Palace, a mile and a half west of Chichester, is the most important Roman residential site in Britain. The palace, begun around AD 75 and likely built for a client king, covered an area larger than Buckingham Palace and contained dozens of richly decorated rooms set around four courtyards. A modern cover building protects the surviving north wing, with its remarkable in-situ mosaic floors — including the celebrated Cupid on a Dolphin — visible from a raised walkway.
The museum and reconstructed Roman garden around the site fill out the picture. Allow at least two hours. The site is reached by a fifteen-minute walk from Fishbourne railway station.