The long buildings are likely the fair’s temporary state pavilions — large white tent-like structures decorated with neoclassical columns that house exhibits for the states and territories on the National Mall. They’re part of the Great American State Fair’s setup, which also includes specialty exhibits, rides, and other attractions.

What they are

  • Large temporary pavilions for each state and territory.
  • Designed to look more formal, with columns and a neoclassical style.
  • Used for interactive displays about culture, heritage, and natural landscapes.

Why they stand out

  • They appear as the main “long buildings” because the fair is built as a row of big exhibition tents rather than permanent buildings.
  • Reports describe the fairgrounds as having dozens of these pavilions stretching across the Mall.

In plain words

If you saw a long row of building-like structures at the fair, those are almost certainly the state exhibit tents/pavilions , not regular buildings.