The Omar Ali Saifuddien Mosque is a magnificent Islamic mosque located in Bandar Seri Begawan, the capital city of Brunei. The mosque was built in 1958 and is named after the 28th Sultan of Brunei, Sultan Omar Ali Saifuddien III, who ruled the country from 1950 until 1967.

The mosque's most prominent feature is its large golden dome, which is supported by pillars made of Italian marble. The dome is covered in pure gold, and it is surrounded by a lagoon that reflects its image, making it one of the most picturesque mosques in the world. The mosque also features a large prayer hall, several minarets, and a beautifully landscaped garden that adds to the serene atmosphere of the site.

The prayer hall is decorated with intricate carvings and stunning chandeliers, while the floor is made of a combination of Italian marble and Scottish granite. The hall can accommodate over 3,000 worshippers at a time and is open to both Muslims and non-Muslims for visitation outside of prayer times.

The mosque is a major attraction in Brunei, and it is frequently visited by tourists who come to admire its stunning architecture and tranquil atmosphere. It is also used for various religious events, including Eid al-Fitr and Eid al-Adha, as well as other special occasions in Brunei's Islamic calendar. Overall, the Omar Ali Saifuddien Mosque is a must-see attraction for anyone visiting Brunei, and it is a symbol of the country's rich Islamic heritage and culture.