Once more, thanks to BritishBattles.com:
The HMS Victory can be toured in Portsmouth Harbor, Portsmouth, UK: http://www.hms-victory.com/ and http://www.historicdockyard.co.uk/site-attractions/attractions/hms-victory.
One of the surviving sails can also be seen in a controlled environment. I’ve seen it twice. It’s well worth the climb up the floor where it’s maintained:
To coincide with the bi-centennial celebrations of the Battle of Trafalgar in 2005, a permanent exhibition was created focusing on HMS Victory’s surviving fore topsail. Victory apart, the sail is recognised by experts as the largest surviving original artefact from the Battle.