About a kilometre south of the main temple complex, in an open quarry that was still being worked when the Roman builders were active, lie several enormous unfinished blocks of limestone that were evidently intended for the temple foundations. The most famous is the Stone of the Pregnant Woman — local legend claims a pregnant woman once claimed she could move it by magic, and the name stuck.
The stone is roughly 21 metres long, 4 metres wide, and 4 metres high, lying in its original quarry bed at a slight angle. You can walk around it and touch it; there are no barriers. Beside it, a second large block was discovered in 1996, and a third (the largest yet found) in 2014, still partially attached to the bedrock.
The site is easily visited on foot or by taxi from the main ruins. The stones raise questions about ancient engineering that archaeologists and engineers have debated for over a century without reaching consensus.