Surabaya is Indonesia's second-largest city with a population of over 2.7 million (5.6 million in the metropolitan area), and the capital of the province of East Java. Shoppers will enjoy the extensive shopping centers and boutiques throughout the city. Others may wish to take in Bonbin Surabaya, one of the largest zoos in Southeast Asia. Other points of interest include the Grand Mosque of Surabaya (the largest mosque in East Java), the Mpu Tantular Museum of Javanese culture, and the Submarine Monument, also known as Monumen Kapal Selam. City sightseeing buses with English-speaking tour guides are available at the House of Sampoerna museum.