TravelrsCheck allows you to determine your travel destinations based on foreign exchange prices. Using the Bloomberg API, I created a history of exchange prices between many different countries. Storing this in MongoDB, I was able to do statistical analysis to determine how preferable it is to travel to a given country for the given day. I was able to provide a visualization of this information using D3.js. The Google Maps API allows people to envision where in a currency zone they may want to travel.