Vía Verde de la Sierra en Puerto Serrano Nature · Puerto Serrano, Sierra de Cádiz, Cádiz Puerto Serrano is one of the endpoints of the Vía Verde de la Sierra, the route of the former early-20th-century Jerez-Almargen railway converted into a greenway, with caves such as El Palilla and Los Murciélagos nearby. Photo: El Pantera (CC BY-SA 4.0) What to see and do in Puerto Serrano