The Haji Ali Dargah in Mumbai is located on an islet in Worli, approximately 500 meters from the coast, and appears to float in the middle of the Arabian Sea during high tide. It was built in 1431 in memory of Saint Haji Ali Shah Bukhari. The other options are famous monuments but not located 'in the middle of the sea' - Fatehpur Sikri and Char Minar are inland, while Lal Quila is a fort.