Anyone interested to join?
The rules are,
Its primarily consist of places listed on US National Register of Historic places. You upload your photo under free license, the duration is for the whole month of October.

There are 10 winners,
1st place $500
2nd place $350
3rd place $200
4-10th place got 50$ each.
https://commons.wikimedia.org/wiki/Commons:Wiki_Loves_Monuments_2021_in_the_United_States