And inspiring. 

I don't know how much of that is the food allergy lifestyle, but I suspect that is part of it. 
All the way down O'Connell, through Temple Bar and Grafton Street, around to Trinity, etc. Then left us in downtown Dublin with maps and directions back to the hotel, while he ran back to the airport for the rest of the group, which should have arrived during the early afternoon (but wound up delayed until evening). We skipped dinner, since we were completely exhausted by wandering around in Dublin all afternoon on foot. (Think 7-12 MILES of walking--most of it in bitter cold). DD and I are clearly some of the only people who can actually keep pace with the guide. I think that the man is actually a Sherpa. LOL. In a playful moment, DD has speculated that it would tickle him no end if everyone from her school that went on the trip were to don identical custom tees for a group shot-- "{guide-name} was my Personal Trainer-- Europe, 2013"
). We returned to Dublin a bit too short on time to get to the writer's museum, but did get some shopping in before dinner. Love me a town with personalized items in both my name(s) and DD's.
Yes, I went to a bookstore as my one and only "MUST" see thing near Piccadilly in London. Bought a copy of Peter Ackroyd's eponymous tome of the city's "biography" for good measure.
On a more serious note, standing inside of Henry VIII's chapel at Hampton Court on Good Friday was more than a little moving and surreal.
I again thought of Mac. 
We went to L'Orangerie to see the Water Lilies and Picassos, then walked up the Jardin de Tuileries and went to the Musee de Moyen Age, which was also just... wow. Stunning.