The Magic of Shazam!
The route of the Morris Expedition - Billy Batson, Beautia Sivana, Whitey Murphy, and Avi Ducret - in "From Here to the Rock of Eternity":

Fawcett City, USA
Karnak, Egypt
Tyre, Lebanon
Venice, Italy
Samarkand, Uzbekistan
"somewhere in the Himalayan Mountains"

I am also debating whether our intrepid heroes should stop off in Istanbul (not Constantinople), Turkey inbetween Tyre and Venice. And I know Venice has been done to death in fiction, but a plot point involves the sacking of Constantinople by the knights of the Fourth Crusade in 1204; so, visiting the sinking city can't be avoided.