It was built to replace the city's walls, demolished as part of a citywide renovation project in order to host an international exhibition in 1872.The park plan was made by Manuel Atanasio Fuentes [es; qu] and Italian architect Antonio Leonardi.Among the park's features was a zoo, whose animals (and plants) were brought from the Peruvian Amazon by an expedition headed by Henrique Casseu in 1871.[3] After the war, the zoo was reestablished through donations from locals and eventual foreign acquisitions, existing until its decay in the early 20th century, caused by poor hygiene conditions and improper care of the animals, the growth of the city, and the worldwide crisis.[4] During the War of the Pacific, the park housed a garrison and a hospital prior to the occupation, later serving as a headquarters for the Chilean troops.