Dinosaurs once roamed Denver's City Park

What they did: The discovery occurred when the museum conducted a drilling test this January to see if it could tap geothermal energy and took core samples down 1,000 feet into the ground.

What they found: Museum scientists later identified the fossil as part of a vertebra from a plant-eating dinosaur, similar to a Thescelosaurus or Edmontosaurus.

What they're saying: "In my 35 years at the museum, we've never had an opportunity quite like this — to study the deep geologic layers beneath our feet with such precision," Earth sciences research associate Bob Raynolds said in a statement. "That this fossil turned up here, in City Park, is nothing short of magical."

If you go: The fossil is now on display at the museum in the "Discovering Teen Rex" exhibition.