Fossil Cabin Museum
The "World's Oldest Building" was built in 1932. Yes, it's older than the Pyramids of Giza, if you take into consideration the fact that its constructed of dinosaur fossils. The builder, Thomas Boylan, had noble intentions; he originally wanted to construct a complete skeleton. However, realizing his collection of 5,796 bones weighing 102,116 pounds probably came from different species, he decided to make use of them in a more practical fashion. Other names for his homestead included "Dinosaurium" and "The House That Used to Walk."