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Excerpt from article:
If you’ve been shopping for a cave, the Chulo Canyon Cave House in the desert hills near Bisbee, Arizona may be just the right fit. What looks like a smallish cabin from outside turns into a sprawling cavern that dives straight into the depths of a mountain. The owner-built cave home is just shy of 3000 square feet and has all the amenities of a typical ranch house and while the interior is naturally cooled, a series of natural pools up the hillside makes this cave house a truly unique eco retreat for the right spelunker.
   
The main house itself is entered via a very modest, almost ramshackle entrance/sunroom. The cave is actually not naturally formed, and the yellow granite was blasted out by a specialist who supported the ceiling with steel rods. The result is surprisingly natural looking as the main living space is surrounded by roughly hewn undulating rock walls. The raw spaces have been carefully detailed with modern appliances, ample iron work and built in furniture and cabinets. Past the modern high end kitchen is the dining room, bedrooms and a full bath. Being in the desert the owner even wisely installed a dual flush toilet.

Read more:
http://inhabitat.com/the-chulo-canyon-house-is-built-right-into-a-cave-in-arizona/

Built in 1894 by the state of New York for the National Guard, Amsterdam Castle is a 36,000 square foot private residence listed on the National Register of Historic Places New York originally built 100 of these armories, of which nearly 50 are still in use by the National Guard. Other “sister” armories uses include a military museum (Saratoga), art gallery (Manhattan East Side), and a concert hall (Albany). This armory was decommissioned in 1995 and is the only armory converted into a home.

Excerpts from article:http://www.coldwarmissilesilo.com/upstatecastlefront1200.jpg

This magnificent building has 2 suites (featuring King sized beds in each turret) for overnight guests in addition to a 10,000 sq ft gymnasium, a rifle range, a fallout shelter and billiard room. The current owners bought the building in 2005 and embarked on an extensive renovation and redecoration. In addition to returning the building to its lush Victorian decor, the renovation featured environmentally friendly building materials such as low VOC paints and repurposed wood. The castle has Wi-Fi, cable TV and high speed internet, onsite parking for 40 and ample street parking. The gymnasium can hold 1000+ (and 500 seated), making us the largest event and reception facility in the county. The 18” brick walls hold the temperature at a surprisingly ambient level, making it pleasant in summer and heat-effective in winter.

Link with fotos: http://www.upstatecastle.com

Excerpt from original article:

This treehouse by Japanese builder Kobayahsi Takashi was constructed with the express purpose of communicating with outer space. “A sparkling beacon among treetops, it is easy to imagine the dome succeeding at its mission to make contact with alien life,”

…. You can reach the house by a wood ladder and at halfway of your climbing you can stop on a terrace and have a view on the nature.
Link to original article

My comment: There are lots and lots of treehouses online, from very small to very large. Takahashi has built many treehouses. This one is my favorite – high off the ground, small, and elegant!!