Well, I've done the A-Z of countries, so here are some other lists (that I'm not trying to complete!)
New Seven Wonders of the World
In 2006/7 a list of places was created by 'New Open World Corporation' and the public was asked to vote on which should be classed as the new wonders of the world.
That's a fair collection!
Around the World in 80 Treasures is a 10 episode series by the BBC and presented by Dan Cruickshank
if it's in bold then I've visited.