By Maria Cristina Valsecchi

A cross inlaid in the floor of a library marks the spot where Indiana Jones has to dig to access the ancient catacombs of Venice in the film Indiana Jones and the Last Crusade. The catacombs, a network of dark and narrow underground tunnels and tombs, hold the secret that eventually leads Indy to the hideout of the Holy Grail.

Unfortunately, the dramatic scene is a narrative license. "There are no catacombs in Venice, as the town rises on wood piles in the middle of the saltwater Venetian Lagoon. There is no room for underground chambers or passages, and only a few buildings have a basement," says Luigi Fozzati, head of the Archaeological Superintendence of Veneto.

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Source: http://science.nationalgeographic.com/