The Drawbridge, from the Carceri

published 1750/1758

Etching, engraving and scratching, first state. National Gallery of Art, Washington

An imaginary prison of bridges, spiral stairs, towers and arches: architecture grown into a vast space no eye could measure.

Look at

Lines run in every direction, so ropes, beams and stairs cross each other and no single vanishing point holds the space together.
Dark, dense hatching on the near beams and piers against paler, open lines further back pushes the depth out.
The figures are tiny, a few quick strokes each, which turns the architecture into the giant.

Here in the first of six states (Robison 33), from the Carceri, or Imaginary Prisons.
One of thirteen Carceri plates Rosenwald acquired from William H. Schab in 1946 and gave the same year.