Rome is riddled with catacombs and underground tunnels, but few are as intriguing as the catacombs of San Callisto.

These early Christian tombs are a variety of different shapes and sizes, and once housed the remains of up to half a million people.

Although they're on the outskirts of the city they still don't manage to escape the tourist scrum, but with nearly 20km of tunnels it's undeniably worth it.

Via Appia Antica 110-126

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The large palace built by the Quintilii brothers in the 2nd century AD. Commodus was so impressed by it that he got rid of the brothers and appropriated the building. Situated next to Via Appia Antica, it is one of the most imposing monuments of Rome. The museum is very good.

Via Appia Antica. Take the Archeobus leaving from Piazza S. Marco, next to Piazza Venezia

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