Trylon and Perisphere were the architectonical marks of this world exposition.

The Trylon, a kind of needle with a triangular outline was with his height of 700 feet (213 metres) a landmark for the whole exposition area and also visible beyond.

The diameter of the Perisphere was 200 feet (61 metres). The Perisphere contained the exhibition "Democracity", a model of an "ideal" city of the year 2039 by the american architect Henry Dreyfuss.

[1939 | 2 a] View to the base of the Perisphere, unknown photographer NY2, 1940
[1939 | 2 b] Entry into the Perisphere over a far circulating spiral ascent, unknown photographer NY1