David Rawcliffe, the house and monument steward at the National Trust's Chedworth Roman Villa, cleans a Roman mosiac in the new environmentally-controlled conservation shelter on March 19, 2012 near Cirencester, England. More of the 1600-year-old Roman floors will be uncovered over the coming year.

David Rawcliffe, the house and monument steward at the National Trust's Chedworth Roman Villa, inspects part of a Roman mosiac in the bath house preserved in the new environmentally-controlled conservation shelter on March 19, 2012 near Cirencester, England. Opened this month, the multi-million pound building allows visitors to walk on suspended walkways just above the 1600-year-old Roman floors and to see recently excavated mosaics not seen for 150 years, with more to be uncovered over the coming year.