John Walker built a home in 1909 atop Mt. Falcon (a mountain slightly west of Denver, Colorado). The house was struck by lightning and was ruined in 1918. He attempted to build a summer white house for the President around 1911. When his attempts to raise money to continue the building failed, the project was abandoned.
^"The magnificent John Brisben Walker, father of Denver’s Entertainment Industry". May 19, 2010. Retrieved 2010-12-15. "John Brisbane Walker Sr., agriculturalist, writer, promoter and publisher of Cosmopolitan magazine, was born Sept. 10, 1847, at his parents’ country house on the Monogahela River, near Pittsburgh, Penn. A West Point graduate, Walker served with the U.S. Minister to China before moving to West Virginia to make a fortune as an iron manufacturer. ..."