Step 1: Open a Google Doc

Create a list of the places or artworks you want to visit with their hyperlinks

Check this #arthistoryflip example from the XIXth century

Step 2: Sign in or Open Tour Builder and "create a new tour"

Step 3: 1) you "add a location" and 2) you write the hyperlinks of your doc in "Introduction (What's it about?)"

Step 4: When you have done editing you export the tour (download as a KML file)

Step 5: and from now on, you do the same as "Steps to use it" page

With Tour Creator

Easy tutorial made with images (in Catalan, though). Click HERE

Video tutorial done by @EleniKyritsis

Slide tutorial done by @ericcurts