Gabii

At http://phys.org/print296285682.html … excavations at Gabii, to the east of Rome, have revealed a buried structure made of giant stone blocks resembling a Lego construct – but it failed to mention the bits that are pushed in to hold them up. What has been found is a construct that did not use cement to bind them together, an archaeological marker that everyone in the business understands. It is the size of a football pitch and dates back to around 300BC, and had two terraces connected by an elaborate staircase.