The Echo Stoa is located within the sanctuary of Zeus in Olympia, Greece. It is part of an ancient archaeological site excavated and preserved by the German Archaeological Institute at Athens. A stoa is a covered walkway or portico, typically colonnaded and open to the public. In ancient Greece, a stoa could be used for a variety of reasons including the selling and display of goods, and religious or public meetings. Aside from Delphi, this sanctuary was the most important one in Greece.