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Good collection of Renaissance and Baroque art, including by Velasquez, Titian, Raphael, and Bernini, all owned by the Doria Pamphilj family. Excellent audio guides really bring the paintings to life.
The Galleria Doria Pamphilj is a large private art collection housed in the Palazzo Doria Pamphilj in Rome, Italy, between Via del Corso and Via della Gatta. The principal entrance is on the Via del Corso. The palace façade on Via del Corso is adjacent to a church, Santa Maria in Via Lata. Like the palace, it is still privately owned by the princely Roman family Doria Pamphili. Tours of the state rooms often culminate in concerts of Baroque and Renaissance music, paying tribute to the setting and the masterpieces it contains.
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Museo Nazionale del Palazzo di Venezia
In the very heart of the city center, the building was for centuries ago the seat of the Venice embassy. Today it houses a museum and art galleries.
More of an enormous traffic circle than a piazza, but a good central location. The centerpiece is the enormous Vittorio Emanuele Monument (aka the Wedding Cake or the Typewriter) with the Capitoline hill next door. Mussolini used to harangue Romans from the first floor balcony of Palazzo Venezia (see under Museums), to the west of the square.
This is one of the two main Jesuit churches in Rome, the other being the nearby Sant'Ignazio. The interior is Mannerist art on steroids. Simply astounding.
Built in honour of Victor Emmanuel, the first king of a unified Italy, this vast structure may appear to be solid white marble but actually contains many rooms inside. There are two permanent museums, one on Italian Reunification and one on emigration from Italy, as well as other spaces that host rotating exhibitions. A walk through the Flag Room leads to the tomb of the unknown soldier. Good views from half-way up but you can also pay €10 (€2 concessions) and take a lift all the way to the top.
Ballroom-like church which crowns part of the Capitoline Hill. Don't be fooled by the plain stone exterior.
Mercati di Traiano
On the other side of the Via dei Fori Imperiali to the Roman Forum. Well-preserved market area that doubled as a way of stopping the Quirinal Hill from collapsing. Below in the Forum is Trajan's Column, built in 113 with reliefs depicting the Emperor Trajan's victories in battle.