Christopher Furlong/Getty Images

Heritage Officer Nick Herepath views the remains of a Roman hypocaust hidden beneath a Spud-U-Like outlet on September 11, 2008, in Chester, England. The Roman hypocaust heated part of a Legionary bath house above the streets of Chester. The hidden treasure is one of hundreds of sites opened for Heritage Open Days, an event that celebrates England's architecture and culture by offering free access to properties that are usually closed to the public or normally charge for admission.

UPDATE: Here's what the shop looks like above.