The architecture of Valletta's streets and piazzas ranges from mid-16th century Baroque to Modernism. The city is the island's principal cultural center and has a unique collection of churches, palaces and museums and act as one of the city's main visitor attractions. When Benjamin Disraeli, future British Prime Minister, visited the city in 1830, he described it as "a city of palaces built by gentlemen for gentlemen," and remarked that "Valletta equals in its noble architecture, if it does not excel, any capital in Europe," and in other letters called it "comparable to Venice and Cádiz" and "full of palaces worthy of Palladio."