backbone-router.js

var Router = Backbone.Router.extend({

  init: function() {
    this.views = [];
  },

  routes: {
    'load/:index': 'loadView'
  },

  instanciateView: function(index) {
    var model = new Backbone.Model({
      index: parseInt(index, 10),
      name: 'view' + index
    });
    
    // just creating a view
    return new View({ model: model });
  },

  loadView: function(index) {
    var view = this.instanciateView(index);

    // store view in an array to access it later
    this.views.push(view);

    // (tip) problem is in line below
    $('#app').html(view.render().$el);
  }
});