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From Heroes Wiki

The following locations have to date been visited only in the Heroes graphic novel.

Alaska	Antarctica	Arizona	Atlanta, GA
Australia	Baltimore, MD	Berlin, Germany	Billings, MT
Black Hawk, CO	Chicago, IL	Congo	Côte d'Azur, France
Denver, CO	Germany	Goa, India	Hiroshima, Japan
Hong Kong	Israel	Levittown, NY	Milan, Italy
Missoula, MT	Paris, France	Paro, Bhutan	Peach Pit, GA
Port Arlesburgh	Tanzania	Vietnam	Youngstown, OH

For locations from the Episodes, please see World Locations