National Roman Museum - Palazzo Massimo alle Terme

Housed in a 19th-century palazzo across from Termini station, Palazzo Massimo alle Terme is one of the four sites making up the National Roman Museum and holds some of the best-preserved Roman wall paintings anywhere, including the garden frescoes lifted from Livia's villa. Reviewers consistently note how calm and uncrowded it feels compared to Rome's headline sights, a rare quality for a collection this significant. Its 4.6 rating and maximum culture score reflect genuine scholarly weight, while its still-modest hidden-gem score suggests it's known to serious visitors more than casual passersby. The lower floors also hold an outstanding numismatic collection for anyone interested in ancient coinage.