Matt York/AP/Shutterstock

This one?s a head-scratcher. Location: Phoenix, Arizona
Year built: 1967
Architect: Frank Lloyd Wright
Specs: 3 beds, 3 baths, 3,095 square feet, 1.32 acres
Price: $7,950,000

Designed by Frank Lloyd Wright just before his death in 1959, the house commissioned by Norman and Aimee Lykes in the suburbs north of Phoenix was ultimately built in 1967 by Wright?s apprentice, John Rattenbury.
Sometimes referred to as the ?Circular Sun House? and one of only 14 circular residences by Wright, the home is a perfect example of Wright?s curvy, late-career style (also see: the Guggenheim). From above, the desert mountain structure and its crescent-shaped pool look like a set of intricate clock gears (Wright credited the curving ridge lines of the surrounding hills as his inspiration). The curves continue inside, with sloping walls clad in golden-hued Philippine mahogany, circular and semicircular windows, custom built-ins, and original Wright?designed furniture. The kitchen counters are wrapped in stainless steel and the slate floors were sourced from India.

Matt York/AP/Shutterstock
In the living room, a built-in sofa lines the edge of the light-filled room while Wright-designed chairs sit in front of a fireplace.

In 1994, new owners hired Rattenbury to update the interiors and the architect made significant changes, transforming the original five bedrooms (some of which were as small as closets) into three. The Taliesin W...