Photo Royalties and Sales:
These are websites which will allow you to both sell and place royalties on your photos for paid reusage.
500px is a photography community/photo sharing website which allows you to upload high definition photographs. On 500px, you can license your photographs for paid re-use as well as sell your photographs at fixed rates.
Royalty Free Photo Sales:
These are websites which will allow you to sell your photographs.
Getty Images is a royalty free photograph marketplace. Aside from selling your photographs on the webiste itself, there are ways you can link a portfolio or photo collection you may have on a service such as Flickr and sell the content through Getty.
Shutterstock is another royalty-free marketplace, which also accepts contents such as vectors, svideo clips, and music tracks.