Google My Maps

It's pretty neat to see a list of addresses mapped out with pins on a Google Map, but to me the best feature is checking addresses to make sure they're proper.  The instructions at the link below will get into the details, but after uploading a CSV file any addresses it can't map are highlighted in red in a data table.  Nice for validating large mailing lists such as wedding invitations or newsletters.

https://www.google.com/earth/outreach/learn/visualize-your-data-on-a-custom-map-using-google-my-maps