Riddle

59.921169966306, 30.283110847201 (OpenStreetMap, Google Maps, Yandex Maps)

Imagine a bridge over the Neva River. A wooden one. A single-arched bridge, but so high that a sailing ship may pass underneath. No, not wooden, an iron one. A three- or even four-span bridge. Illuminated by floodlights. A bridge with elaborate self-moving carriages driving across it. Imagine that all this is created by you without the knowledge of Performance of Construction Materials, the benefits of tungsten wire and the design of the internal combustion engine. Did you imagine all this? If yes, then you can the square named after you.
Memorial in the centre. Fourth line from the bottom
Redraw the third letter

Detailed answer

Bridges across the Neva River appeared relatively late, but the initial projects, first a wooden one-arch bridge, then an iron three- or four-span bridge, were designed in the 18th century already. Just like the floodlights models and improved drawings of self-moving vehicles, these projects belonged the distinguished Russian inventor Kulibin. You need to find ploshchad Kulibina.

Answer: ө


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