CityTur is an iPhone app developed by Sergey Zhalybin that allows users to create photos of landmarks with geo-tags, which can then be entered into a contest for the best composition. The app provides a unique way for travelers and photography enthusiasts to showcase their creativity and explore new locations.

With CityTur, users can easily capture stunning photos of famous landmarks and add geo-tags to mark the exact location. The app also provides a user-friendly interface for editing and enhancing the photos, ensuring that users can create visually appealing compositions.

One of the standout features of CityTur is the contest aspect. Users can submit their geo-tagged photos to the website's administration for consideration in the best composition contest. This adds an element of competition and motivation for users to create their best work.

Overall, CityTur offers a fun and interactive way to explore landmarks, capture beautiful photos, and participate in a contest to showcase your skills. Whether you're a travel enthusiast or a photography lover, this app is worth checking out.