The Porta Alchemica is the only survivor of the five gates of the villa Palombara ; there was a lost door on the opposite side dating them to 1680 and four other lost inscriptions on the walls of the mansion inside the villa .
Porta Alchemica is the only survivor of the five gates of the Palombara villa , there was an lost door on the opposite side enabling to give it a date of 1680 , there were also four other inscriptions lost on the walls of the mansion inside the villa .