Suwon, South Korea
The late mayor of Suwon, South Korea, Sim Jae-Duck, built his loo-shaped, two-story home to mark the 2007 inaugural meeting of the World Toilet Association
. Jae-Duck—reportedly born in a restroom—made it his life's work to advocate for clean, efficient, and working sanitation for more than 2 billion people living without toilets worldwide. The 4,520-square-foot steel, concrete, and glass structure set "Mayor Toilet" back a cool $1.1 million. It features a showcase, glass-walled bathroom at it's center. Those concerned with privacy can turn the walls opaque at the touch of a button. The home also features a roof-top balcony that's accessible by a "toilet drain" staircase and equipped with rainwater harvesting technology.