Gmail Lab yesterday announced a new feature about itself that it has added a new experimental level feature. The new feature lets you know where you penned that mail. In additional users can add their signature with the city and country location.
New Gmail feature lets the recipients of your e-mails know where you were when you wrote to them.So that this new features lets the recipients of your emails that where you were while writing the mails.

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If you want to enable this feature, turn on Location in Signature from the Labs tab under Settings, then go to your signature preferences and check the box next to “Append your location to the signature.”  [ Thank You ]