Largest megalith from antiquity

Excavations carried out at a quarry near the ancient city of Baalbek (formerly Heliopolis), Lebanon, by the German Archaeological Institute, in partnership with Dr Jeanine Abdul Massih of Lebanon University, in July 2014 unearthed a megalithic stone block measuring 19.6 m long, 6 m wide and at least 5.5 m tall (approx. 64 x 19 x 18 ft). The full block is still partially buried, hence why the height is not known for sure and further digs are required to ascertain this. It is estimated to weigh approximately 1,650 tonnes (1,819 US tons). The megalith is positioned beneath and to the side of another large stone block known as Hajjar al-Hibla ("The Stone of the Pregnant Woman"), another massive megalith of around 1,000 tonnes (1,100 US tons), dating to c. 27 BCE. Similar-sized completed worked stones can be found in the foundations of the nearby Roman Temple of Jupiter (completed c. 60 CE), for which the quarry supplied the majority of the materials for construction.

The archaeologists concluded that because of the stone's configuration and level of smoothness, the superlative block was meant to be transported without being cut.

It's postulated that the Hajjar al-Hibla megalith may have been left in the quarry because it did not make the cut in terms of quality for carving.