Longest church

The Book of World Records officially recognizes that The crypt of the underground Civil War Memorial Church in the Guadarrama Mountains, in the Valley of the Fallen 45 km (28 miles) from Madrid, Spain, is 260 m (853 ft) in length, making it the longest church in the world. It took 21 years (1937-58) to build, at a reported cost of £;140 million ($229 million or €211 million), and is surmounted by a concrete cross 152.4 m (500 ft)  tall.