Civic Museum of Siena
Siena, Tuscany, Italy

A must-see for its collection of paintings by Lorenzetti, Simone Martini and other Sienese masters. One of the highlights is Simone Martini’s Maesta fresco (1315); another is Lorenzetti’s fresco cycle The Allegory of Good and The Effects of Bad Government (1338-40).
Adult price: £8
Best for ages 18+