When I first saw these photos I thought it was some kind of secret military energy generator, an antimatter weapon, proof that an UFO crashed at Roswell or perhaps a device to communicate with other galaxies. I wasn't that wrong.
It's used for communication, but not with other galaxies - unless you believe that God lives there. It's the United States Air Force Academy Cadet Chapel in El Paso County, Colorado. It was built in 1954 by Skidmore, Owings & Merrill.
Its interior looks as science-fictionish as the exterior:
The chapel is formed by 17 rows of spires, rising 46m up in the air. The spires are made with steel tube frames, using 100 tetrahedrons that are exactly the same and weigh five tons. Between the tetrahedrons, the architects installed coloured glass, which further enhances the building's space age character.