Just to be clear: This is NOT an Amerinoc problem. It is somewhere around here, and I have NO idea what 
I
can access all sites if I go thru Tor Network, but as you all know - that is slooooow!
I have tested on a Windows machine as well, flushed dns, cleared history/cache, restartet modem, router.
I posted a link to one of the sites via Facebook, to ask my friends that have the same ISP as me to check. Funny enough, the link loads there with photo and description.
I have sent an email to my ISP, but knowing them it will take a couple of days until I get an answer to "restart your modem" or something like that....