The Abraj Al-Bait Towers, also known as the Makkah Royal Clock Tower Hotel, is a government-owned megatall building complex in Mecca, Saudi Arabia. These towers are a part of the King Abdulaziz Endowment Project that strives to modernize the city in catering to its pilgrims. The central hotel building has the world's largest clock face and is the third tallest building and fourth tallest freestanding structure in the world. The building complex is metres away from the world's second largest mosque and Islam's most sacred site, the Masjid al-Haram. The developer and contractor of the complex is the Saudi Binladin Group, the Kingdom's largest construction company. The complex was built after the demolition of the Ajyad Fortress, the 18th-century Ottoman citadel which stood atop a hill overlooking the Grand Mosque.