Dem bones, dem old dinosaur bones ...

A tiny museum billed as the "oldest building in the world" because of the thousands of dinosaur bones within its walls has expanded visitor hours.

Como Bluff Museum, near Medicine Bow, Wyoming, is housed in a cabin built with 5776 bones weighing more than 4590 tonnes, according to a book, Wyoming Place Names by Mae Urbanek.

The bones are up to two million years old and were taken from a nearby dinosaur graveyard discovered by railroad employees in 1871.

Inside the 63-year-old cabin are many items, including a leg from a brontosaurus, several dinosaur eggs and numerous fossils of squid, clams, turtles and sharks' teeth.