The small temple-like building is the supposed Tomb of Iphigeneia. According Eurypides And mortals will in future times celebrate Artemis Tauropolos with hymns. And establish this law: whenever the people keep the festival, let a sword be held to a man's throat and draw out blood, in atonement for your sacrifice, so that the goddess may have her honors, and holiness is revered. You, Iphigenia, must be key-holder for this goddess on the hallowed stairs of Brauron, and will die there and be buried1.
See:
- John J. Coulton,, BRAURON (Vraona) Attica, Greece, in: The Princeton encyclopedia of classical sites. Stillwell, Richard. MacDonald, William L. McAlister, Marian Holland. Princeton, N.J. Princeton University Press. 1976.
- Euripides. The Complete Greek Drama, edited by Whitney J. Oates and Eugene O'Neill, Jr. in two volumes. 1. Iphigenia in Tauris, translated by Robert Potter. New York. Random House. 1938
- Brian Clark, BRAURON. The Sacred Sanctuary of Artemis- https://www.astrosynthesis.com.au/wp-content/uploads/2017/11/Sanctuary-of-Artemis-Brauron-Brian-Clark.pdf