Manila, the capital of the Philippines, is a densely populated bayside city on the island of Luzon, which mixes Spanish colonial architecture with modern skyscrapers. Intramuros, a walled city in colonial times, is the heart of Old Manila. It’s home to the baroque 16th-century San Agustin Church as well as Fort Santiago, a storied citadel and military prison. Manila became the center of Spanish activity in the Far East and one end of the Manila-Acapulco Galleon trade route, linking Spanish America with Asia, one of the earliest examples of globalization. Together with the rest of the Philippines, Manila lies entirely within the tropics. Its proximity to the equator means that the temperature range is very small, rarely going below 20 °C (68 °F) or above 38 °C (100 °F). Humidity levels are usually very high all year round. Manila has a distinct dry season from December through May, and a relatively lengthy wet season that covers the remaining period with slightly cooler temperatures. Tourism is a vital industry in Manila, and it welcomes approximately over 1 million tourists each year. Major destinations include the walled city of Intramuros, the National Theater at the Cultural Center of the Philippines, Manila Ocean Park, Binondo, Ermita, Malate, Manila Zoo, National Museum of the Philippines and Rizal Park.