The National Monument, or "Monas" as it is popularly called, is one of the monuments built during the Sukarno era of fierce nationalism. The top of the National Monument (Monas) is Freedom Square. It stands for the people's determination to achieve freedom and the crowning of their efforts in the Proclamation of Independence in August 1945. The Istiqlal Mosque stands out with its 45m diameter dome and tall minarets. Standing almost right across the old Catholic Church at the corner of Jalan Lapangan Banteng, the Istiqlal mosque was designed in 1954 by Frederich Silaban, a Christian architect from North Sumatra. The idea for the need of a national mosque was inspired by Muslim leader KH Wahid Hashim and executed by Cokro Aminoto, then minister for religious affairs. Istiqlal meaning 'Independence', is a reminder of Indonesia's struggle for national Independence. Its 17 years construction was personally supervised by President Soekarno. In this sprawling metropolis of a city, it's hard to imagine that Jakarta was once confined to just a small area here around an area that was known as Batavia. Today it is called Old Town or Kota Tua - and it's a reminder of the centuries of Indonesian history dominated by Europeans. Sea World Jakarta or also known Sea World Ancol is a marine aquarium suited in North Jakarta, Jakarta, Indonesia. It consists of 1 Main tank, 1 shark tank, and several other tanks, also the white crocodile exhibit. The Main tank of the Sea World Ancol is the biggest aquarium in the Southeast Asia. Sea World Ancol was closed at September 2014 but since 17 July 2015 has been reopened to the public. The owner company is currently expanding to turn the facility as the world's largest sea park.