If you don’t get the noise and icon, try zooming in and out and gently moving around the area of the click. If you hold that position and zoom in you should hear a whir and see a map icon appear indicating an area has been marked to your map.

Anywhere worth visiting will make a clicking noise as you look over it. You get them shortly after meeting the engineer Krest on the crane to look at various landmarks he calls out.

Quick tip before you go anywhere: use your binoculars to look around regularly.