What is associated with: completed in 1931 this structure required 10 million bricks a true stairmaster would climb its 1860 steps?

What is associated with: completed in 1914 it stretches from the atlantic to the pacific? What is associated with: completed in 1916 this russian railroad is the longest in the world? What is associated with: completed in 1930 this william van alen skyscraper in nyc is in the art deco style? What is associated with: completed in 1931 it rises over 1400 feet at 350 fifth avenue in new york city? What is associated with: completed in 1932 it bears the inscription here rests in honored glory an american soldier kno… What is associated with: completed in 1937 this 2000 mile hiking trail passes through 14 states? What is associated with: completed in 1937 this span cost 35 million to build? What is associated with: completed in 1942 this dam contains about 12 million cubic yards of concrete?