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"California. The Vacation State that's good all year" TWA timetable c. 1950 #FindYourPark #NPS100 This tweet was posted on August 25, 2016.

Did you know @GoldenGateNPS is one of the world's largest urban national parks? #FindYourPark #NPS100 This tweet was posted on August 25, 2016.

Did you know that there was a National Parks Airways? It flew from SLC to Yellowstone in the 1930s. #NPS100 This tweet was posted on August 25, 2016.

Happy 100th birthday, @NatlParkService! Half Dome in Yosemite is featured on this 1950s @United postcard. #NPS100 This tweet was posted on August 25, 2016.

National Parks are frequently advertised by airline such as this 1970s Air Cal timetable featuring Yosemite. #NPS100 This tweet was posted on August 25, 2016.

S. H. Page, mechanical engineer, & aerial photographer, documented San Francisco circa 1920. #SFHistory #NPS100 This tweet was posted on August 25, 2016.

This 1935 airmail flight cover was from the Yellowstone National Park Airport dedication. #FindYourPark #NPS100 This tweet was posted on August 25, 2016.