Did the Labyrinth have concentric circular walls with passages blocked by radials or it did it have rectangular lines? Or do we simply not know?
It is a commonly held belief that The Labyrinth is in fact the Palace of Knossos
The Labyrinth has been described as :
... a maze-like building of winding corridors and complicated twists and turns, which confused anyone who entered it so much that he could not find the way out.
Which could be considered an apt description of the palace.
The Palace of Knossos
And according to legend :
Knossos itself was built by the architect Daedalus
The Minoan building complex at Knossos, from the excavations of Arthur Evans (1851 – 1941)
The settlement of Knossos is associated with the palace of king Minos who housed the Minotaur, as Wikipedia tells us. There are, however, as far as I know, no actual remains discovered of the labyrinth itself. A common interpretation is that the Laybyrinth is actually the palace.
However, Wikipedia also shows us a coin that supposedly is from Knossos, around 400BC, that looks like this:
Whether the coin represents the actual labyrinth (if that ever existed) or an artist impression of what they thought the labyrinth would have looked like is of course hard to tell.
But Philochorus writeth, that the Cretans do not confess that, but say that this labyrinth was a gail or prison, in the which they had no other hurt, saving that they which were kept there under lock and key could not fly nor start away.
Source: Plut. Thes.