ModernMapMarkers is an addon that places markers on the world map for dungeons, raids, wold bosses, boats, zeppelins, trams and portals. This is a vanilla 1.12.1 fork of the original TurtleWoW addon by tilr & Heallios.

Clicking on transport markers (boats, zeppelins, trams and portals) will change the map to their destination. Markers with two destinations show a left/right click hint for each destination.

Portals, by default disabled, are a feature as well. Might be useful if your server makes use of custom portals.

You can easily add/remove/edit marker info by editing the MarkerData.lua file.

The addon supports Atlas and AtlasQuest. Clicking on dungeon, raid, world boss markers will open up Atlas on the corresponding page. Altas-CFM is also supported (make sure to disable the Altas-CFM markers from its options menu).

pfUI and ShaguTweaks are also supported.

Type /mmm to enable/disable world map dropdown menus.

Type /mmm hints to enable/disable transport marker click hints.

Video demonstration:
https://www.youtube.com/watch?v=F5iku0JxY7w