Visit a City - Create your personal travel guide
Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.
GetYourGuide - Get tickets to the most popular attractions while travelling
Wikitravel - This article is a Movie/TV Tour.
Modern Atlas - Discover where to travel
Foursquare - Foursquare is all about helping you find new ways to explore your city.