The massive megastructure built for eternity and still standing 1,700 years later

By Justin Calderon, CNN Anuradhapura, Sri Lanka (CNN) — Visit the ancient city of Anuradhapura on a full moon day and the past feels anything but distant. Buddhist pilgrims dressed in white walk barefoot along dusty paths. Saffron-robed monks chant at dawn. Foreign visitors — from Taiwan to Canada — join local worshipers in rituals