> Parts of Peru and Bolivia (especially around Lake Titicaca) are littered with ruins that are still in relatively good condition, there are terraces dug into t

> Parts of Peru and Bolivia (especially around Lake Titicaca) are littered with ruins that are still in relatively good condition, there are terraces dug into the hills that have existed for over 500 years now. My understanding is many of these have undergone substantial partial restoration to preserve them in a somewhat arbitrarily determined state of ruin. So it's not really obvious how well they've aged, they're not left to decay naturally. It was a fairly controversial thing when they decided to start rebuilding Machu Picchu. "Most of the outlying buildings have been reconstructed in order to give tourists a better idea of how they originally appeared. By 1976, 30% of Machu Picchu had been restored and restoration continues." From https://en.wikipedia.org/wiki/Machu_Picchu https://en.wikipedia.org/wiki/Machu_Picchu