Coordinates : 41 ° 53 ′ 43 ″ N 12 ° 30 ′ 14 ″ E \ / 41.89541222 ° N 12.50377122 ° E \ / 41.89541222 ; 12.50377122 The Porta Alchemica ( English : Alchemical Door ) or Alchemy Gate or Magic Portal , is a monument built between 1678 and 1680 by Massimiliano Palombara marquis of Pietraforte in his residence the Villa Palombara .
Coordinates : 41 ° 53 ′ 43 ″ N 12 ° 30 ′ 14 ″ E \ / 41.89541222 ° N 12.50377122 ° E \ / 41.89541222 ; 12.50377122 Porta Alchemica ( English : alchemical door ) , or Alchemy Gate or Magic Portal , is an ancient monument built between 1678 and 1680 by Massimiliano Palombara marquis of Pietraforte ( 1614-1680 ) in his residence , Palombara villa , located in the east of Rome on the Esquilino hill in a position almost corresponding to Piazza Vittorio , where today was placed .