#1 would have to be War and Peace, wonderful wonderful, deserves the regard it has.
I took a winter to read it. Prince Andrew is so noble, even foolishly so at times. When he's wounded at Austerlitz, looking at the sky as a great inverted blue bowl is still a vivid memory.
When Natasha and Andrew meet on the train I cried through the whole scene, page after page. My husband finally asked me if I was okay.
And then just as I was reading Natasha's Christmas in the country on the family estate and the thrilling nighttime sleigh ride with her brother our neighbors came by with an old sleigh they just bought for Christmas!
Pulled by their truck, not horses, they invited us to take a ride. We grabbed coats, blankets and a bottle of bourbon and climbed aboard. We lived in the country, snow on the ground, bright wolf moon in a clear winter sky, they pulled us fast across fields of snow.
It was so romantic, I felt like Natasha in old Russia. Really nice adjunct to the read.