The 1,700-year-old megastructure history almost forgot
cnn.comTFA is a stub that points to a longer-form article here: https://archive.ph/1Mg8f
I got so confused by that list of stubs, I read several of them expecting some sort of narrative arc to be completed pointing back at the opening.
It is a pretty amazing structure.
Sri Lanka in general has many things that are unknown. The palace fortress of Sigiriya is one. The huge ancient irrigation systems are another.