Fossil Cabin, commercieel gebouw in Wyoming, Verenigde Staten van Amerika

Fossil Cabin is a 29-foot by 19-foot building near Medicine Bow, Wyoming, constructed in 1932 from 5,796 dinosaur bones weighing 102,116 pounds, excavated at nearby Como Bluff. Thomas Boylan and his son assembled the bones into walls, giving the structure a rough, bone-textured exterior.

Thomas Boylan, born in California in 1863, arrived in Wyoming in 1892 and filed a homestead near Como Bluff in 1908, where dinosaur bones had been found in the 1870s. He collected 5,796 bones weighing 102,116 pounds over seventeen years, then built the 29-by-19-foot cabin in 1932 with his son for the 1933 tourist season. After a 1938 Ripley's Believe It or Not mention, he called it the "Creation Museum."

Boylan printed postcards by 1936 calling the cabin the "Como Bluff Dinosaurium," and after a 1938 mention in Ripley's Believe It or Not he also billed it as the "Creation Museum" and "The Building that Used to Walk." His widow Grace ran the gas station until the 1960s, when Interstate 80 diverted traffic from Route 30.

The cabin sits on the north side of US Route 30 about eleven miles east of Medicine Bow, near the Como Bluff cut. It is a roadside structure with no interior access; visitors see the bone walls from the shoulder. Interstate 80 runs parallel to the south, so the site is reached by exiting and following the old highway.

Boylan weighed the 5,796 bones at 102,116 pounds (46,319 kg) and had hoped to assemble a complete dinosaur skeleton before giving up and using them as walls. After Ripley's 1938 column, he also advertised the building as the "Creation Museum" and "The Building that Used to Walk."