People visit the Archaeological Park of Ostia Antica in Rome, Italy, Aug. 19, 2020. Ostia Antica is a large archaeological site near the modern town of Ostia. The site dates back to the 4th century BC, according to studies. (Xinhua/Cheng Tingting)

People visit the Archaeological Park of Ostia Antica in Rome, Italy, Aug. 19, 2020. Ostia Antica is a large archaeological site near the modern town of Ostia. The site dates back to the 4th century BC, according to studies. (Xinhua/Cheng Tingting)

People take photos at the Archaeological Park of Ostia Antica in Rome, Italy, Aug. 19, 2020. Ostia Antica is a large archaeological site near the modern town of Ostia. The site dates back to the 4th century BC, according to studies. (Xinhua/Cheng Tingting)

People visit the Archaeological Park of Ostia Antica in Rome, Italy, Aug. 19, 2020. Ostia Antica is a large archaeological site near the modern town of Ostia. The site dates back to the 4th century BC, according to studies. (Xinhua/Cheng Tingting)

People visit the Archaeological Park of Ostia Antica in Rome, Italy, Aug. 19, 2020. Ostia Antica is a large archaeological site near the modern town of Ostia. The site dates back to the 4th century BC, according to studies. (Xinhua/Cheng Tingting)

People visit the Archaeological Park of Ostia Antica in Rome, Italy, Aug. 19, 2020. Ostia Antica is a large archaeological site near the modern town of Ostia. The site dates back to the 4th century BC, according to studies. (Xinhua/Cheng Tingting)