While outside you can walk through the great north entrance into the most complete Roman amphitheatre in Britain, where families can imagine the din of 6,000 people calling to be entertained.
Y tu allan, gallwch gerdded drwy'r fynedfa fawr i'r gogledd i'r amffitheatr Rufeinig fwyaf cyflawn ym Mhrydain, ac yno gall teuluoedd ddychmygu torf o 6,000 o bobl yn ymgasglu i gael eu difyrru.