This is an interesting way to encourage people to contribute to Wikipedia. The "get out and explore your city" motivation reminds me of Pokemon Go... but this time you're sharing what you find with the world via Wikipedia.

In my immediate area (Williamstown - a suburb of Melbourne) the only monuments listed are train stations, but once you get into the city it looks more interesting.

One suggestion - add a big tagline at the top of the page. If I scroll down and read the text I understand what is going on, but it would be great to make it obvious right up front. "Explore monuments in your city and share your photos on Wikipedia".

[edit] it's not very usable on my phone - I can use a map but when I click an icon it opens a list that is off to the right of the screen, and I can't scroll to it. A mobile first interface would be ideal for getting me to go out and participate. A big "monuments near me" button that opens the map to my current location, and then the ability to take a photo from my camera. Should be a pretty easy fix/feature that would make this way more spontaneous and fun to use when on a phone.