SpotWorld is a new travel app that combines user-generated reviews via social networking apps like Yelp and check-in services like Foursquare.With SpotWorld, you can check-in to more than 500,000 cities and landmarks across North America, Europe and Asia, from museums to parks and restaurants. You can also add tips, photos and ratings to your favorite places. The app displays background about popular locations from Wikipedia, including history, geography and demographics, as well as photos and audio readings. We tried out the app in New York City's Financial District and discovered some new information about famous landmarks like the New York Stock Exchange, Trinity Church and the Federal Reserve Bank. (Did you know that the New York Fed reportedly holds 25% of the world's existing gold bullion?) You can also view itineraries from other SpotWorld members or upload your own.