temple and their function is not yet clear. The oracular procedure so well documented at Delphi is almost unknown at Didyma and must be reconstructed on the basis of the temple's construction. The priestess sat above the oracle spring and was inspired by Apollo. The prophet announced the oracle probably from the room with the high and impassable threshold. The answers were delivered, as in Delphi, in classical hexameters. But at Delphi, nothing was written; at Didyma, inquiries and answers were written and some inscriptions with them were found. In Didyma a small structure, the Chresmographion featured in this process; it was situated outside the temple because according to inscriptions it was used for storing architectural members for the temple there. Although the construction work continued for over 600 years the temple of Apollo was never completed. But the main body of the temple itself had been completed around 100 BC. In the following centuries Miletus continued to erect the columns of the colonnade. The columns of the eastern façade were built during the reign of emperor Hadrian. The western facade was completed too and some columns on the flanks. The roof was also never entirely finished; the temple lacked the pediments. There were also other parts of this huge temple which remained unfinished. Therefore, this building is totally unique in Greek architecture. It is like a handbook on this topic which informs you about all the different stages of constructing a temple. When something is unfinished it becomes easier to see the process of construction. This „book" begins in the quarries of Miletus at the former Latmian Gulf (today Bafa Gölü) and lead from the harbours there to the harbour of Didyma (former Panormos, today Mavisehir). From there along the road to the sanctuary and then into the sanctuary. At all these places unfinished architectural members of the temple are visible. The inner walls of the sekos remained unpolished too. That's why Lothar Haselberger could discover there the Hellenistic construction drawings. This discovery and interpretation led to some important information about the planning and the building phase of the Apollo temple. In particular, the very famous one of the draft of a column of the temple of Apollo is on the northern sekos wall. On the western wall inside the sekos the inscribed pictorial instructions of the pediment of a small temple is scratched in. Because the inscribed architectural