Tangier is an interesting mix of north Africa, Spain, and France. It is located in north Africa, was under the control of France for the first half of the 20th century, and is less than 20 miles from Spain across the Strait of Gibraltar.
Frequent ferries make the short crossing from Europe each day, and many cruise ships sailing between the Mediterranean and the Atlantic often include Tangier as a port of call. I visited Tangier from the Windstar Wind Surf and took an excellent half-day shore excursion, "A Taste of Tangier", which gave us a short time at several Tangier sites. It was just a taste, but enough to leave us wanting more of Tangier and Morocco.