on this link, a 360-degree picture of the view from the fort of copacabana can be seen -  the cannons, copacabana beach, and the sugar loaf can all be seen by navigating this beautiful image by ayrton.

this link shows the fort of copacabana on a wikimapia - the link as we present it is best seen using google chrome, as it might not open correctly with other browsers.   

the forte de copacabana is located at praça coronel eugênio franco, nº1, copacabana, posto 6, tel. 21. 2522.4460 or 21. 2521.1032.