From How the Old World Found the New by Barnard and Tall, 1929.

From Wee Wisdom, 1938.

Here's a precursor to the Jefferson Airplane album After Bathing at Baxter's, in which a quirky airplane incorporates an entire house.  From The Judge, 1920.  [Thank you, Jonathan!]

A houseboat on the river Styx for the 100th reunion of the class of 1899.  From Johns Hopkins' 1899 yearbook.

From Le Charivari, 1887.

From The Judge, 1920.

From L'Album Comique de la Famille, 1904.

Here's a precursor to the mobile home/recreational vehicle -- if we have houseboats, why not house cars?  From Le Rire, 1904.

"Queer houseboat propelled by engine and air screw."  (Aren't they all?)  A headline from Popular Mechanics, 1920.

Here's a prediction of mobile homes in the year 2000.