The Baalbek Stones are six massive Roman worked stone blocks in Baalbek (ancient Heliopolis), Lebanon, characterised by a megalithic gigantism unparallelled in antiquity. The smallest three are part of a podium wall in the Roman complex of the Temple of Jupiter Baal (Heliopolitan Zeus) on Tel Baalbek and are known as the "Trilithon". Each of these is estimated at about . The remaining three are Roman monoliths, not part of a larger structure, conventionally known as the "Stone of the Pregnant Woman" (estimated at 1,000 t), the "Stone of the South" (est. 1,242 t), and the "Forgotten Stone" (est. 1,650 t). These are, in reverse order, the first, third, and tied fifth largest known stones ever quarried in human history. They are believed to have been intended for the nearby Jupiter Baal complex, possibly as an addition to the Trilithon; but, perhaps due to their size, they were never removed from their quarry. They have not been used since their extraction in ancient times. Numerous archaeological expeditions have gone to the site starting in the 19th century, primarily German and French groups, and research has continued into the 21st century. Stone of the Pregnant Woman The Stone of the Pregnant Woman (), also called the First Monolith, still lies in the ancient quarry at a distance of 900 m from the Heliopolis temple complex. Although the smallest of the three monoliths, it is also the most famous due to its fine condition, the imposing angle at which it lies, and its never having been fully hidden by earth. In 1996, a geodetic team of the Austrian city of Linz conducted topographical measurements at the site which aimed at establishing the exact dimensions of the two monoliths and their possible use in the construction of the gigantic Jupiter temple. According to their calculations, the block weighs 1,000.12 t, thus practically confirming older estimations such as that of Jean-Pierre Adam. The rectangular stone block is: 20.31–20.76 m long 4 m wide at the base 4.14–5.29 m wide at the top 4.21–4.32 m high Has an estimated density of 2.6–2.8 g/cm3 There are multiple stories behind the name. One says the monolith is named after a pregnant woman who tricked the people of Baalbek into believing that she knew how to move the giant stone if only they would feed her until she gave birth. Others say the name comes from the legends