In this Oct. 23, 2015 file photo, welds are seen going up the south leg of the stainless steel Gateway Arch in St. Louis. Under President Dwight D. Eisehower, the nation prepared for the 50th birthday of the National Park Service with a spending splurge that refurbished Independence Hall in Philadelphia and helped complete the Gateway Arch in St. Louis and the 469-mile Blue Ridge Parkway. Next year, the world-famous system turns 100 and the celebration will be far more modest. (AP Photo/Jeff Roberson, File)