This undated photo released courtesy Bob Walker showing cats walking along a custom stairway in the inside of a home in San Diego Calif. Bob Walker and Frances Mooney moved into the house in 1986 and ... more 
This undated photo released courtesy Bob Walker showing cats walking along a custom stairway in the inside of a home in San Diego Calif. Bob Walker and Frances Mooney moved into the house in 1986 and started converting it into a human-sized cat condo with 140 feet of elevated highway, tunnels, ramps, a spiral staircase, rest areas and scenic vistas. It even had a floor to ceiling scratching post. One improvement seemed to lead to another. (AP Photo/Courtesy Bob Walker) less 
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Associated Press | Photo By Courtesy Bob Walker
Wed, Jul 17, 2013 2:04 PM EDT