Follow these instructions:
- Each cluster represents a group of markers. Click on it to zoom in and show all the markers inside of it.
- Each marker represents a location where a graffiti was spotted and is still there.
- Each marker represents a location where a graffiti was spotted but later got cleaned.
- To see the information related to the graffiti at a location, just click on the associated marker.
- Click and hold it in order to drag the map.
- Click home or hit "F5" to refresh the page.