http://www.minapolis.com/index.php/2013/09/23/catedral-rusa-de-niza/dsc01308/
How do i show a bigger image in the attachment?
Well there is no more space available.
For my demo you can see here: http://colorawesomeness.com/travelify/post-format-test-gallery/ I am using Jetpack (http://wordpress.org/plugins/jetpack/) lightbox function. However, you can choose any other lightbox plugin available.