From classicfm.com:

Yo Yo Ma, playing Bach's Cello Suite No. 1

Nature: 

Golitha Falls Video

Waterfall Hike, Pennsylvania

Wynton Marsalis recording "Abblasen" for CBS Sunday Morning

Ricket's Glen, waterfall hike, Pennsylvania

Aspen/Ajax Mountain, Colorado

Authors & Actors Reading Books Online

• Storyline Online: Books read by Screen Actors Guild on YouTube; also has a free app.
• Example: Harry the Dirty Dog read by Betty White
• Operation Storytime: Author Mac Barnett is also reading a different book every day at 3 PM ET via Instagram Live.  See a list with links to specific books below.

Virtual Tours:

• US National Park Service (We have A LOT of parks in the US!)
• 14 World-Class Museums

Animals on Explore.org: Live cameras all over the WORLD  (Annenberg Foundation, with no ads, see below for some of my favorites) 

Fun Webcams: 

Olifants West Game Reserve Webcam, South Africa, explore.org

Puppy Playroom!! - explore.org

Kentucky Equine Adoption Center, explore.org

Tropical Fish Webcam from explore.org

Decorah Eagles 

NASA Space Cam!