Ostia Antica is an important archeological site that once was the seaport for Rome. It is located less than 20 miles from Rome at the mouth of the River Tiber. The site has well-preserved ancient buildings, some of which date back to the fourth century BC. Ostia Antica is known for the outstanding frescoes and mosaics on these old buildings, as well as ancient public toilets that turned bathrooms into a social setting.