See also the posting on April 20th for more on Kosho-ji.
Dogen’s original temple at Koshoji was destroyed by fire soon after the community moved to Eiheiji and the current temple was built in the sixteenth century over the original site. For me (Iain speaking) the most important building was the Ryobai-an, a small hall which served as a founder’s shrine to Dogen located next to the present meditation hall. By Iain.

The Ryobai-an, the building where Dogen Zenji’s remains are.