Philadelphia has had its share of shining moments, but one of the historical highlights was in 1876, when the world arrived on our doorstep for the Centennial Exposition — the first World’s Fair ever held in the United States. For six months, Fairmount Park became the center of everything: a place where innovation, art, architecture, and global imagination collided in the most spectacular way. Today, Memorial Hall still carries that glow, and stepping inside feels like touching a piece of the moment when Philadelphia introduced itself to the world.