23 palaces visited by Shirah

Austrian Parliament Building

Belém Palace

Belvedere Vienna

Buckingham Palace

Doge's Palace

Greek Parliament

Hampton Court Palace

Hofburg

Les Invalides

Mariinsky Palace

Palace of Westminster

Palazzo Vecchio

Palazzo Venezia

Pena National Palace

Petergof

Prince's Palace of Monaco

Royal Palace of Madrid

Saint Michael's Palace

Schönbrunn Palace

Siena City Hall

Summer Palace of Peter the Great

Topkapi

Vienna City Hall