They just listed all their internships for summer 2017
film production
marketing
casting
scheduling
IT
Visual Design
Business and Accounting
and many more
This is the homepage for internships https://corporate.discovery.com/careers/internships/
job search page https://hub-discovery.icims.com/jobs/search?ss=1&searchPositionType=8710&mobile=false&width=920&height=500&bga=true&needsRedirect=false&jan1offset=-360&jun1offset=-300
multiple cities
the random ones I clicked on were all PAID