After a late start in life, I have been bitten by the travel bug in recent years. Work only allows relatively brief time windows, so little tastes of places are just serving to whet my appetite to go back. So far (since July 2016):
SW England and Ireland. We met with utak in London, and robbiec in Cork.
Northern Italy Beijing to Fukuoka by ship (must go back to Japan for a proper trip)
Next week(!) I'm off to Buenos Aires, Iguazu Falls, Ushuaia and Antarctica. Over Christmas and New Year we will be cruising around New Zealand on the same ship as the Asian sojourn of last year (my daughter works on The Ovation of the Seas).
Next June we'll do London, Le Mans (for the 24 hour race) and Paris.
A conference in Prague in 2020 will provide an opportunity to see bits of Switzerland, Austria and Germany on the way.
Shock! Horror! I still haven't been to the USA. As a climber, Yosemite is high on my (long) list of back country destinations, and my wife would insist on the Big Apple. I have a close cousin in Rhode Island, and there are several Pentax Forums contacts I'd be keen to visit
Western Canada to Alaska by sea would be amazing, and the arctic NE of Canada also has a pull.
Iceland, Norway, etc in winter to chase the northern lights, and again in autumn for the scenery.
Going deeper into some of these places will have to wait for retirement