Right next to the Delphi archaeological site is the Sanctuary of Athena Pronaia. It is a much smaller site, and I am not sure if it is technically considered to be part of the Delphi site. The main ruins at the site are those of the Thosos, which is a round building. A neat feature at the site is a mountain spring that flows onto the site and is channeled away in a small stone canal.
Sanctuary of Athena Pronaia with Delphi in the background
Sanctuary of Athena Pronaia
The Tholos
Lego pieces
Mountain spring
Channel for the spring at the site