There are a bunch of right-wingers out there that would tell you (((they))) are working on that. That's basically the heart of the whole "Great Replacement" conspiracy theory and I've seen a few specifically point to Paris as an example of it in action.
Depends on what you want to get out of your hike. Want historic sites and a café? Go hike an old city. Want mosquitos and beautiful open vistas? Go hike a mountain trail.