Masjid al-Haram in Saudi Arabia has been valued at $100 billion and ranked the world's most expensive building by Fly Abu Dhabi. Saudi Arabia's Abraj Al Bait, valued at $15 billion, and Singapore's Resorts World Sentosa, valued at $6.59 billion, have been placed second and third respectively. Singapore's Marina Bay Sands and United States' The Cosmopolitan complete the top five.