All the pins on the Places map now have a unique id, called a 'Marker Id' to enable unique identification of a pin. This also means that each pin has a unique URL.
To get this URL, open your places activity in preview mode.
Just click on the pin (which will bring the pin to focus on the map) and copy the browser displayed URL to share this unique pin.
In the example above the sharable URL is - https://demonstration.engagementhq.com/places/maps/Park#marker-7572.
When a user clicks on the URL, the map will open with marker id pin 7572 in focus.
NOTE - Both administrators and participants can copy the URL from the browser window.