World Map of the WONDERFUL WORLD OF OZ!

World Map of the WONDERFUL WORLD OF OZ!
Map created for "After Dark Murder Mystery Events," an organization that organizes murder mystery events across the UK and is currently working on a Wizard of Oz-themed event.
One of the puzzles the detectives will have to solve is based on this treasure map inspired by the Wizarding World of Oz! Angela and I had a lot of fun working on this map, which is full of mysteries and puzzles. Can you spot any helpful clues? Take a look at the map, maybe you'll discover something interesting!