Trace (Project Message Botol), is a social media app to expose Indonesian Tourist Destinations, it lets people leave a message, image, video, etc in the form of a bubble on a map, where other users may explore their surroundings and see messages about "what's happening here" in real-time. It also has a mission feature where users can do the mission to find and visit local destinations. This application contains machine learning models to filter inappropriate content and to detect landmarks for the mission feature.