Adriano Morabito is a Rome native who is still passionate about his city and its less well-known sites, began focusing his attention on urban speleology in 1999. He is one of the founders of "Roma Sotterranea," an association active in the exploration and study of underground tombs of historical and archaelogical interest: www.romasotterranea.itMarco Gradozzi is also a Rome native who still lives in the Campo Marzio district, Marco Gradozzi has a passion for archaelogy, photography, music and folk traditions. He has been an active participant in the "Roma Sotterranea" association since 2007. Website: www.romansurvey.itGinevra Lovatelli is the author of the first version of this guide. She organizes original private tours to discover Rome. Website: www.secretrome.com