Cryptoportique

"A Gallo-Roman underground gallery and crypt, now a semi-subterranean venue for municipal expositions, was initially constructed around AD 200 beneath the forum of Reims's predecessor, the Roman town of Durocortorum." Full review

"One of Reims' Roman standouts, the below-street-level Cryptoportique is thought to have been used for grain storage in the 3rd century AD" Full review