The "center" of the culture was the settlement of Tiryns that saw further development during the Mycenean period.
Some examples of metal tool finds from this culture include a dagger, a nail, a pin from Lerna, and three axes from Thebes.
[1] The best known types of pottery from this era consist of two classes of pattern-painted ceramics: At Lerna and Olympia, several "long houses" or megara with two or three rooms and narrow alleyways had been built.
A tumulus was constructed over the ruins of the Helladic II House of the Tiles, and for a long period of time, no buildings were built in the specific area.
Many large (for the period) buildings were constructed in Lerna, but they often lasted for only one generation.