Drupal has a number of default paths that are created automatically:
/node/3 : Node with id of 3
/user : User login screen, or user profile if already logged in
/user/3 : User with id of 3
/user/password : Request new password
/user/register : Create a new account
/user/login : Login page
/blog : Blog summary for site
/search : Search page
/admin/content/node-settings/rebuild : Rebuild permissions for site.