While in Santa Fe a couple weeks ago, we ventured over to Pecos to see pueblo ruins and attempt to gawk at "The Fir Tree", a house Frank Lloyd Wright built for Arnold Friedman. The house sits along the headwaters of the Pecos River nestled among (you guessed it) fir trees. Although the house is nearly invisible from the road, the gate and associated stonework is clearly Wright. This house was based, in part, on the neverbuilts of a resort for Lake Tahoe.
Update (April 9, 2013):
The Architectural Record recently posted some photos of this house. A couple are below, and here is the link to read the article and see more photos.