But it's amazing how much the entire world looks like Devon.

Just like all alien planets look like quarries! :D

But yes, I get that with old American shows, too. No matter where they're supposed to be, the terrain always looks like southern California. Sometimes you even recognize it: "I know we're watching 'Man from U.N.C.L.E., but aren't those the cliffs that were in that one 'Star Trek' episode?"