There are certain maps that have a permanent +100% experience boost:

Saphael maps:

Winterflake Forest
Ancient Polar Ruins
Auris Bay

All Deepfathom maps:
Keep in mind Deepfathom maps are 71+ // 81 for Stolak Island

Spirit Valley
Misty Plateau
Golden Sandbar
Aurawhisp Hamlet
Frostfire Pass
Heirloom Peninsula

There are also dungeons that have a permanent +150% experience boost, here is the full confirmed list:

Mutated Sunken Mechanical Fortress
Mutated Phoenix Tower
Mutated Black Flame Ruins
Mutated Forbidden Temple
Mutated Blazing Kaslow - added as of 6/17/2016

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