Archaeologist Maria Tecla Castaldi said most of the tombs are sealed and presumably intact, ANSA reported Wednesday.

Over 6,000 tombs have been uncovered on the Tarquinia site since excavations first began in 1489.

The Tarquinia tombs are filled with everyday objects and wall paintings that give an insight into the habits and customs of the Etruscans, the Italian news service said. Tarquinia and Cerveteri were declared Italy's 37th World Heritage Site in 2004.