Among the ruins on the Palatine Hill is a structure that experts believe was built for Emperor Augustus' wife, Livia. It's known as the House of Livia, and is still being excavated.
The House of Livia was probably built in the early 1st century B.C.E., with frescoes added later in that century. Livia made this her primary residence, staying even after the emperor had died, when her son Tiberius became Rome's second emperor. The building's frescoes are wonderfully well-preserved, and feature an ancient trompe l'oeil effect with painted ceilings designed to look like coffers and painted scenes made to look like views through open windows.
The ruins on the Palatine Hill are open to the public starting at 8:30am, with the closing time varying from 4:30pm-6:30pm depending on the season. A 48-hour combined ticket that includes the Colosseum, Forum, and Palatine Hill costs €12. Children under age 18 are admitted for free, and there's free admission the first Sunday of every month. The House of Livia is still undergoing excavation and restoration work, so is only accessible with a guided tour.