For centuries, the vanished Inca fortress of Ancocagua existed only in lore. Now, at a mountaintop site in Peru, researchers are zeroing in on a discovery that could reshape what we know of the empire ...

The following cell is not shown either in the book. It creates the images/end_to_end_project folder (if it doesn't already exist), and it defines the save_fig() function which is used through this ...