Rome is to put over 30 historical sites including a gladiators training ground and the aqueduct that feeds the Trevi Fountain on display for the first time.

The sites, part of a vast network of tunnels, caves and catacombs which lie beneath the city, will be open from the end of this month.

Gianni Alemanno, the mayor of Rome, said the aim of the project was to "avoid Rome being known only for its most important monuments."