Istiqlal is Arabic for "Independence," and Jakarta's prized mosque was built to celebrate Indonesia's independence. It also happens to be the largest mosque in all of Southeast Asia. Built under Sukarno's presidency, it sprawls across nine hectares (22 acres) and has five levels, with a massive dome crowning it all. Much of the structure is clad in marble from East Java. Inside, 16,000 worshipers can be accommodated for prayer at one time. While non-Muslims aren't allowed in the main prayer hall, it's possible for everyone to visit the impressive upper hallways and terraces.