Additional statues were added to the collection by Paul III and Pius IV during the 16th century, as well as by Clemens XII and Benedict XIV during the 18th century. Over the years the museum was constantly enriched by new donations, acquisitions and archaeological finds, while a consistent amount of new material reached the museums following the urbanistic works carried out after 1870, when Rome became the capital of Italy. The Museums are housed in two separate palaces, facing each other on the Piazza del Campidoglio: Palazzo dei Conservatori and Palazzo Nuovo. The first was built in 1560, but only after one century, the Palazzo Nuovo was finished by Girolamo Rinaldi. With the Palazzo Senatorio, they form the architectural composition of Piazza del Campidoglio, with its distinctive trapezoid shape, originally designed by Michelangelo. Since its foundation, the museum has exclusively been devoted to ancient statuary. The famous equestrian statue of Marcus Aurelius, a bronze original dating back to 175 AD, has recently been relocated inside the museums in order to preserve it from pollution , the one outside, is in fact a copy. One of the most famous pieces on display is the Galata Morente (the Dying Gaul), copy of an original bronze statue donated to the temple of Athena by Attalus I after his victory on the Gauls. Also remarkable are the Capitoline Venus, and the Wounded Amazon, from an original by Phydias dating back to the 5th century BC.