Da Vinci Code Day 23

What can I say?

Similar to last geography challenge, even before assembling the jigsaw, it was obvious that the city is Paris, thanks to the picture of the lawns around eiffel tower. Everybody who has visited the eiffel tower has a few pictures of those lawns (??) in their collection. After I submitted my answer as 'Paris', just like the previous geography puzzles, it asked me to find symbols, not one or two but nine symbols this time.

The symbols were connected and another question came up asking about the sequence 0,1,4,9... The correct answer was 'Square Numbers'.

Last day tomorrow...