I am very keen on the internet video lectures entitled TED Lectures. |These are lectures given by very articulate people in big conference halls anywhere in the world for an invited audience who pay (lots!).
There was one in Edinburgh in July. In our part of the world we have similar twice-monthly lectures in the winter season here in Glasgow. They are run by the Royal Philosophical Society of Glasgow.
As TED says "Great talks to stir your curiosity"
Attribution to OnlineClasses.org