This city is full of things to see and do, so it can be difficult to narrow down what you should see first. Here are some of the best things to see in Tangier: The Kasbah - This is a fortress-like building that was built during medieval times. It also has a mosque inside, making it one of the oldest mosques in Morocco. The Medina - The Medina is home to many ancient buildings and intricately designed houses. You can also walk around this area and get lost in all the winding streets.