The vaults below the Great Court of the Jupiter Temple, together with the supporting walls of the terrace, are noticeable. In the W. wall of the latter occur the three famous megaliths, which gave the name _Trilithon_ to the Jupiter temple in Byzantine times. These measure from 63 to 64 ft. in length and 13 ft. in height and breadth, and have been raised 20 ft. above the ground. They are the largest blocks known to have been used in actual construction, but are excelled by another block still attached to its bed in the quarries half a mile S.W. This is 68 ft. long by 14 ft. high and weighs about 1500 tons. For long these blocks were supposed, even by European visitors, to be relics of a primeval race of giant builders.

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