8 Iconic Buildings To Watch In Oman8 Iconic Buildings To Watch In Oman1. Al Alam Palace Year: 19722. Sultan Qaboos Grand Mosque Year: 20013. Royal Opera House Year: 20114. Nizwa Fort Year: 1650s5. Sohar Fort Year: 17th CenturyAl-Mirani Fort Year: 1587(rebuilt)7. Bait Al Zubair Year: 19988. Mohammed Al Ameen Mosque Year: 2014