Rabat is the current capital of Morocco and is home to several important historical sites, including the Hassan Tower, the Kasbah of the Udayas, and the Chellah Necropolis.
Fez is known for its well-preserved medina, which is the largest car-free urban area in the world. The medina is home to several important religious and educational institutions, including the Al-Qarawiyyin Mosque and University, which was founded in 859.
Marrakech is known for its famous square, Jemaa el-Fnaa, which is a hub of activity day and night. The city is also home to several important historical sites, including the Bahia Palace, the Saadian Tombs, and the Koutoubia Mosque.
Meknes is a smaller city but still boasts several important historical sites, including the Bab Mansour gate, the Mausoleum of Moulay Ismail, and the Royal Stables.
A tour of the Imperial Cities typically includes visits to all four cities, as well as guided tours of the main sights.