Chedworth Roman Villa (near Cirencester) was discovered in 1864- and one of the charms of the site- with its mock-Tudor custodian's house and museum- is that it has been preserved very much as its finders left it. It is as much a monument to Victorian archaeology- on the cusp between gentlemanly antiquarianism and modern science- as it is to the Roman past.
It was raining heavily when we were there. Ailz chose to stay in the car, but I borrowed an umbrella from visitors' centre and sloshed my way round.
One of several mosaics (from the school of Corinium)