Thinking of visiting London this summer for the Olympics? Or New York City for a business trip in the coming weeks? Well as it so happens, Fodor’s 6 city-based Travel Guides for the iPhone and iPad (a universal app) have dropped from $5.99 to free. All city guides offer expert reviews of restaurants, shops, hotels and hotspots to visit, exclusive Fodor’s Choice picks and even downloadable offline and interactive maps to help avoid those roaming charges. The ability to bookmark favorites and take ‘field’ notes for every recommendation is also available for its users. The freebie offer isn’t likely to last long, so be sure to grab the apps below before they go back up in price.