Staying at the Un Letto Ideale Eur hotel, you will be 1.7 miles from Catacombe di San Callisto and 4.2 miles the aqueduct-fed rococo Trevi Fountain. If you are willing to explore even more landmarks in Rome, consider checking out the underground Christian cemetery "Catacombs of St Domitilla Catacombe di San Domitilla" set 1.5 miles away.