Are these worth anything?

Try searching HIFiShark for the Sold/Expired listings for NHT speakers. It may take awhile to find the ones you're interested in, there are more than 7,000 sales recorded. Click on the "Site" label at the top of the listings to sort them by the country where the sale occurred. 

One of the towers has an opening in the cabinet seem. 

If you are a DIY type of guy, you could disassemble the speaker and have the cabinet repaired. You would probably want to have both done at the same time so they match. Not sure it would be worth a repair for resale purposes. 

Give to Salvation Army Thrift store ASAP!!