Google Maps tracks everywhere you go on your iPhone or Android phone, and then keeps a log of this information in a "Timeline" that shows you everywhere you've been.

This includes a creepy level of detail, like exactly when you left work, when you arrived at home, the exact route you took along the way, pictures you took in specific locations and more. It'll show you if you were driving, walking or on a train, and any pit stops you might have made during your journey.

Sometimes this information can be useful, like if you want to remember the restaurant you ate at on Nov. 7 in New York City. (For me, it was Philippe Chow), and what you did before and after that.

Here's an example of that day, including my stop for lunch, and a meeting I took with Snapchat on the Upper West side earlier in the day.