Alien

They came from a planet far far away.
Not really, this is the Haslingden Halo
The Halo is an artwork set on the expended landfill site (or top 'o' slate) overlooking the town of Haslingden in Rossendale, positioned to be clearly visible from the M66 and A56 approach to Lancashire. It is located at grid reference SD791236. The Halo was the fourth and final Panopticon to be constructed in Lancashire and was launched in September 2007.
The Halo is an 18m-diameter steel lattice structure supported on a tripod five metres above the ground. The core is open at the top, framing views of the sky. It is lit after dark using low-energy LEDs powered by an adjacent wind turbine and glows a sky-blue colour, giving the effect of hovering above the town. It was designed by John Kennedy of LandLab.

http://en.wikipedia.org/wiki/Panopticons