The Pantheon consists of a 34m by 13.6m 'pronaos', or portico, and a 43.2m inner diameter circular 'cella', or main temple, crowned by a dome. The pronaos has three rows of Corinthian columns that stand 14 meters tall. Each weighs 60 tons.
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Why there are no straight lines in the Parthenon? In order for the temple to maintain a symmetrical and light appearance, straight lines weren't the best. The Greeks resorted to the Entasis, which is a very light curve voluntarily made on the central part of the shafts of the columns.