Simply put, when any unrelated Sim is near your active Sims, you might see a push notification of the visitor being attracted to your Sim.
World Adventures does a wonderful job of transporting you to these fictional towns, not only presenting you with some stunning scenery but tying in everything from the architecture to the sound track to really set the style and tone of each locale.
For instance, if you needed help with the Tomb of Discovery then, hopefully, you should be able to hit ctrl F and type in "Tomb of Discovery" minus the quotes to find it. Remember that you don't age when travelling so you can go to your vacation home and work on improving skills, build a large garden, or make money using skills like your writing.
I tried to copy as much in game text down as exactly as I could so you can search for strings of text in the guide to find what you're looking for. Before you Raid Tombs [xx Tombsxx] ===================================== Before you start wandering into tombs, the best way to explore them is to do so while doing an adventure.
Attraction can occur for any number of reasons, though you'll likely see it most often when Sims learn new skills.
When there is attraction between two Sims, each gets a buff if they're in the same room together.
After finding a tomb to raid and dodging a few fire traps, Dave happens upon a secret door behind which lies an ancient sarcophagus.