This two-story toilet-shaped building was originally built in 2007 as the private home of Sim Jae-Duck, former congressman and mayor of Suwon.

Known as "Mr. Toilet", the eccentric Sim was reportedly born in a bathroom and developed an interest in toilets during his mayoral term. He later founded the World Toilet Association General Assembly and served as its inaugural chairman.

"The toilet is not merely a place for excretion — it can save humankind from diseases," Mr. Toilet told delegates at a Toilet Assembly in Bali. "A place of relaxation and purging, the toilet is a place for introspection. The toilet is also a central living place that possesses culture."

Upon Mr. Toilet's death in 2009, the 420-square-meter house was turned into a toilet museum, and remains a place of homage to everyone's favorite seat in the house.

At Mr. Toilet House, visitors can view exhibitions on the history of restrooms, quirky bathroom signs from around the world, activities to spread and fund public bathrooms in underdeveloped countries, and of course, go to the toilet themselves, which is the grandest room in the house and located in the center of the building.