Sir Nikolaus Pevsner was one of the twentieth century's most learned and stimulating writers on art and architecture. He established his reputation with Pioneers of Modern Design, though he is probably best known for his celebrated series of guides, The Buildings of England, acknowledged as one of the great achievements of twentieth-century scholarship. He was also founding editor of The Pelican History of Art, the most comprehensive and scholarly history of art ever published in English.
My 1979 edition is a little dated now, but that matters little since most of the interesting stuff is historical anyway. Each architect of note has a paragraph or two detailing their major works which is very useful. There are also descriptions of various architectural features, vaults, domes etc. which are also illuminating. This is a useful book to carry about, since architecture of buildings is in a sense an open air art gallery and it is useful to be able to identify the salient features.