Temples are 'caged' against the ravages of time by scaffolding in the 270-hectare Selinunte archaeological park near Trapani
Selinus and the nearby non-Greek (Elymian) city of Segesta were enemies; Segesta persuaded Athens to come to their aid in 415 B.C. by fooling the Athenians into thinking they had a lot more money available than they did--the beginning of the disastrous Sicilian Expedition of 415-413 which was an important contributing factor in the eventual Athenian defeat in the Peloponnesian War.
I guess that’s a similar idea to what they did to preserve the Casa Grande in Arizona, where they built a roof over it.