This is a listing of SmartPhone and Tablet Apps that will be of benefit to the visitor from overseas. 

USA.gov Mobile Site and iPhone App

Chimani ~ USA National Parks ~ Apps for the Outdoors ~ Android iPhone iPod iPad ~ Free 
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http://www.chimani.com/#

New York City ~ Mobile Apps for the Visitor and Local alike ~ Android and Apple  

Discover New England Travel Apps  

Frommer's ~ Mobile Apps 

New York City Apps ~ iPad iPhone Android ~ Fee & Free 

Apps to Show Off Your iPad 

Mobile App Page ~ National Park Service (NPS) 

Various ~ Travel Companion Apps for the USA 

Reader's Digest Digital Editions ~ Tablets & E~Readers 

Your Art ~ National Gallery of Art ~ Mobile App for SmartPhones & Tablets ~ Android & Apple 

Museum of Flight, Seattle  ~ Cockpit360 App for iPhone iPad 

Disney World ~ Mobile Apps