"Popocatepetl"@en . . . "Popocatepetl"@en . . "Popocatepetl is an active volcano located above the Valley of Mexico. It is the country's second highest peak. In the 16th century, Spanish conquistadors used sulfur from Popocatepetl's crater for gunpowder during their attacks on the Aztecs."@en . . . . . . . . "Popocatepetl is an active volcano located above the Valley of Mexico. It is the country's second highest peak. In the 16th century, Spanish conquistadors used sulfur from Popocatepetl's crater for gunpowder during their attacks on the Aztecs."@en .