The 1883 eruption of Krakatoa caused a tsunami that damaged Menara Martello , which the Dutch East India Company built in 1850 on Bidadari Island ( Pulau Bidadari ) , one of the Thousand Islands ( Kepulauan Seribu ) , as part of a set of fortifications that protected the approaches to Batavia . Photos suggest that Martello Menara was not a true Martello , but rather a circular fort . The tower was operational until 1878 , when it became a storage site , and was abandoned in 1908 . Bidadari Island was also known as Pulau Sakit ( Sick Island ) as it housed a leper colony during the 17th century . More recently , the island came to be called " Angel Island " , to honour the leprosarium that had been there
1883 eruption of Krakatoa
1883 eruption of Krakatoa
Martello tower