Happy 100th birthday to the Rocky Mountain National Park! To mark the milestone, Expedition 42 Flight Engineer Terry Virts posted this photograph, taken from the International Space Station, to Twitter. Virts wrote, "Majestic peaks and trails! Happy 100th anniversary RockyNPS So much beauty to behold in our NatlParkService." Image Credit: NASA/Terry Virts Usinterior #RockyMountain #NationalPark RockyNPS #Colorado #nasa #space #iss #spacestation #exp42 #birthday #RMNP #NatlParkService