Bulla Regia. Tunisia. View of the ground level courtyard with columns at the house of the hunt roman villa. Directly below is an entire underground residence of lavish style with a dining room and bedrooms and centred with open air colonnaded courtyard. Situated in north-western Tunisia and lying in an extremely fertile region the ancient Roman city of Bulla Regia is famed for its unique and distinctive underground villas built by the wealthy Romans in the second and third centuries AD to escape the baking Tunisian summer heat.