This site lists map regions and dungeons by level.
http://www.guildwars2hub.com/guides/exploration/cities-explorable-zones-and-dungeons
Here is an interactive map that shows levels. It is incomplete but is the best I've found so far.
http://gw2.mmorpg-life.com/guild-wars-2-map-with-level-range/337/
This goes directly to the map.
http://gw2.mmorpg-life.com/wp-content/uploads/2012/05/Guild_wars_2_Tyria_level_map.jpg
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