Gmail gives a secure feature to monitor and protect your email account.It provides you with latest 10 IP address that you have logged into the account.By this you can check is some else have logged in your Gmail account.And also it provides the current open location of your Gmail account.
To check these details scroll down your email page you would notice the “Last account activity” label and the Details link.
Click on details link to check the IP addresses from where the gmail account was accessed.There is also a “Sign out all other sessions” button which would logout all the other open locations.
It is better to immediately change your password and security question,to ensure no would further use your account.
By this feature Gmail helps us to protect your account from hackers.