Flickr offers 1 terabyte of storage free.

Yahoo has redesigned its Flickr photo-sharing service, offering users up to 1TB of storage without a fee.

http://www.bbc.co.uk/news/technology-22608122

I've never heard of 500px (another photo sharing site) until I read that hazel, and providing a link for it could even be spammy, but old forum habits die hard.