This, above, is the focal point of the 100 ft long pergola and conservatory extending from the entrance of the Darwin Martin House right to the very back of the garden -- part of a reconstruction currently under way at the 1904 Buffalo house to restore the house and grounds to their former glory after a century of destruction of the grounds, and institutional neglect of the house.
You can see the pergola and conservatory running from right to left through the centre of the plan below.
This slide show and audio at the 'Wright in Buffalo' site gives an update on the progress of the reconstruction. [Hat tip Prairie Mod.] And you can take a virtual tour of the whole complex here at the house's official site. [Click BUILDINGS then MARTIN HOUSE COMPLEX.]