Usage of the "searchmarkers" parameter added in Maps 2.0. It accepts these values:
All
Try searching on "capital of" or "city".
<display_map service="googlemaps3" searchmarkers="all">
New York City~New York City~Home of the great Yaron Koren
Brussels~Brussels~Capital of Belgium
Berlin~Berlin (city)~Capital of Germany
London~London~Capital of the United Kingdom
Norway~Norway~Meanwhile in Norway
</display_map>
Chargement de la carte...
{"type":"ROADMAP","minzoom":false,"maxzoom":false,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"mappingservice":"googlemaps3","width":"auto","height":"350px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"visitedicon":"","wmsoverlay":false,"zoom":false,"layers":[],"controls":["pan","zoom","type","scale","streetview","rotate"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"resizable":false,"kmlrezoom":false,"poi":true,"cluster":false,"clustergridsize":60,"clustermaxzoom":20,"clusterzoomonclick":true,"clusteraveragecenter":true,"clusterminsize":2,"imageoverlays":[],"kml":[],"gkml":[],"searchmarkers":"all","fullscreen":false,"scrollwheelzoom":false,"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ENew York City\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EHome of the great Yaron Koren\n\u003C/p\u003E\u003C/div\u003E","title":"New York City\n","link":"","lat":40.7127281,"lon":-74.0060152,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBrussels\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ECapital of Belgium\n\u003C/p\u003E\u003C/div\u003E","title":"Brussels\n","link":"","lat":50.8550018,"lon":4.3512333761166175,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBerlin (city)\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ECapital of Germany\n\u003C/p\u003E\u003C/div\u003E","title":"Berlin (city)\n","link":"","lat":52.5170365,"lon":13.3888599,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ELondon\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ECapital of the United Kingdom\n\u003C/p\u003E\u003C/div\u003E","title":"London\n","link":"","lat":51.4893335,"lon":-0.14405508452768728,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ENorway\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EMeanwhile in Norway\n\u003C/p\u003E\u003C/div\u003E","title":"Norway\n","link":"","lat":64.5731537,"lon":11.52803643954819,"icon":""}]}
Title
<display_map service="googlemaps3" searchmarkers="title">
New York City~New York City~Home of the great Yaron Koren
Brussels~Brussels~Capital of Belgium
Berlin~Berlin (city)~Capital of Germany
London~London~Capital of the United Kingdom
Norway~Norway~Meanwhile in Norway
</display_map>
Chargement de la carte...
{"type":"ROADMAP","minzoom":false,"maxzoom":false,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"mappingservice":"googlemaps3","width":"auto","height":"350px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"visitedicon":"","wmsoverlay":false,"zoom":false,"layers":[],"controls":["pan","zoom","type","scale","streetview","rotate"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"resizable":false,"kmlrezoom":false,"poi":true,"cluster":false,"clustergridsize":60,"clustermaxzoom":20,"clusterzoomonclick":true,"clusteraveragecenter":true,"clusterminsize":2,"imageoverlays":[],"kml":[],"gkml":[],"searchmarkers":"title","fullscreen":false,"scrollwheelzoom":false,"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ENew York City\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EHome of the great Yaron Koren\n\u003C/p\u003E\u003C/div\u003E","title":"New York City\n","link":"","lat":40.7127281,"lon":-74.0060152,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBrussels\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ECapital of Belgium\n\u003C/p\u003E\u003C/div\u003E","title":"Brussels\n","link":"","lat":50.8550018,"lon":4.3512333761166175,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBerlin (city)\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ECapital of Germany\n\u003C/p\u003E\u003C/div\u003E","title":"Berlin (city)\n","link":"","lat":52.5170365,"lon":13.3888599,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ELondon\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ECapital of the United Kingdom\n\u003C/p\u003E\u003C/div\u003E","title":"London\n","link":"","lat":51.4893335,"lon":-0.14405508452768728,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ENorway\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EMeanwhile in Norway\n\u003C/p\u003E\u003C/div\u003E","title":"Norway\n","link":"","lat":64.5731537,"lon":11.52803643954819,"icon":""}]}