False ruin designed by Francis Cook created out of the chapel built by Gerard de Visme in replacement of the former Chapel of Our Lady of Monserrate. Engulfed by vegetation, the ruin is now inherently bound up with the adjoining Australian rubber tree. The Chapel niche once contained three Etruscan sarcophagi that served as garden ornaments. Today, these are in the collections of the São Miguel de Odrinhas Archaeological Museum in Sintra.