Almost everything to see in Ouidah is connected to one of two histories: the transatlantic slave trade or the Vodun religion. The two are intertwined — many of the enslaved who left through this port carried Vodun across the Atlantic, where it became Haitian Vodou and Brazilian Candomblé.
The standard route in town links the Portuguese fort (now the history museum), the Python Temple, the Basilica, and the 3 km Route des Esclaves down to the Door of No Return on the beach. It is a heavy itinerary; pace yourself.