Most famous UFO Hot Spots on Earth

"There are certain places on earth UFO skeptics should avoid at all costs," begins this show. "They are vortexes for strange encounters." Are there really UFO hot spots in the Hudson River Valley, Stonehenge, and Sedona, Arizona? The show posits that just as some places on earth have more rain, some places have more UFO sightings. What conditions on earth could cause this? Earth energy, or ley lines, the show suggests -- and, as always, the show speaks of these things as if they were scientific fact, rather than mere speculation by believers. Are UFOs drawn to certain spots because of variations in the earth's magnetic fields?