Palazzo Altemps is a striking building known for its simple and elegant lines. Construction first began in 1480 for Count Girolamo Riario, who was the nephew of Pope Sixtus IV. Later on, the architect Martino Longhi continued the work for the new owner, Cardinal Marco Sittico Altemps.
Today, Palazzo Altemps serves as one of the branches of the National Museum of Rome. The museum inside displays a rich collection of ancient and Renaissance sculptures. Visitors can see many works that reflect the 16th and 17th-century taste for restoring ancient statues, often by adding missing parts such as heads or arms. This approach to art restoration gives the collection a unique character, blending original pieces with later additions.
Source - https://en.wikipedia.org/wiki/Palazzo_Altemps