What do we know about ley lines? They are a crack in the earth's tetonic plates. Through this opening magnetic energy is released. Here is a place aliens could harness the energy to run their space ships in a way mere humans do not understand and use it as a road map. It is a known fact animals such as pigeons and whales use these lines to navigate. This is a probable theory but let's plot famous UFO sightings on the ley line grid map and see for ourselves.
Is there a Stargate right here on earth leading to a world parallel with ours? I hope there is a scientist checking into this. With the price of gas these days we sure could use wormholes for travel instead of a gas/money guzzling vehicle.
Be sure to read Part One of this series Ley Lines - A Hotbed for Cryptids and Part Two Ley Lines - A Hotbed for Spirits.