S1, E4: The last leg of Joanna’s journey takes her by dhow to Zanzibar, the spice island of Africa. In this engaging travel documentary, she discovers that merchants from around the world have left their mark on the area’s architecture, religion and music. She travels to Jordan to encounter a Bedouin tribe via camel, then her trek ends at one of the great wonders of the world, the ancient city of Petra.