Al Mirani Fort in Muscat was built by the Portuguese in the 16th century. It, along with neighbouring Al Jalali Fort, looks out to the Gulf of Oman and would guard the port of Muscat in the past. The Mirani Fort and Al Jalali Fort are located on either side of the palace. Although closed to the public, visitors can view this fort from outside. This fort was extremely instrumental in the downfall of the Portuguese. The fort has many ancient war tools on display.
The massive Al Jalali Fort, also known as Ash Sharqiya Fort, was built by the Portuguese in the 16th century. Interestingly it once used to be a prison which has been converted to a heritage private museum. Being located on the harbour, the Al Jalali Fort offers a beautiful view of the entire city of Muscat. The only entrance to this place is through a steep flight of stairs in the front. The entry to this fort is strictly by permit only. You can apply to the Ministry Of National Heritage through the contact page on their website.
The eastern end of the Mutrah Corniche harbour is dominated by the Mutrah Fort. The Fort is generally closed for visitors. However, its flank can be climbed for more great views of the harbour.