left.inc.php

            <aside class="col-md-2">
                <div class="panel panel-info">
                    <div class="panel-heading">Continents</div>
                    <ul class="list-group">
                        <li class="list-group-item"><a href="#">Africa</a></li>
                        <li class="list-group-item"><a href="#">Asia</a></li>
                        <li class="list-group-item"><a href="#">Europe</a></li>
                        <li class="list-group-item"><a href="#">North America</a></li>
                        <li class="list-group-item"><a href="#">South America</a></li>
                    </ul>
                </div>
                <!-- end continents panel -->

                <div class="panel panel-info">
                    <div class="panel-heading">Popular</div>
                    <ul class="list-group">
                        <li class="list-group-item"><a href="#">Canada</a></li>
                        <li class="list-group-item"><a href="#">France</a></li>
                        <li class="list-group-item"><a href="#">Italy</a></li>
                        <li class="list-group-item"><a href="#">Germany</a></li>
                        <li class="list-group-item"><a href="#">Ghana</a></li>
                        <li class="list-group-item"><a href="#">Greece</a></li>
                        <li class="list-group-item"><a href="#">Hungary</a></li>
                        <li class="list-group-item"><a href="#">Spain</a></li>
                        <li class="list-group-item"><a href="#">United States</a></li>
                        <li class="list-group-item"><a href="#">United Kingdom</a></li>
                    </ul>
                </div>
                <!-- end continents panel -->
            </aside>