Rustaq Fort was built in the sixth century, making it one of the oldest forts in the country. Built during the pre-Islamic era of Oman, a visit to this fort is compulsory for history buffs. The hidden pathways, vertical staircases, cannons and the astonishingly large ramparts are sure to make you giddy with excitement. The entire structure is almost completely built using stone, mud, brick and mortar. The fort also houses a mosque, called the Bayadha Mosque and is the resting place of Sultan bin Seif. It has also undergone a massive restoration process leaving it in its full grandeur.