If you could go any where in the world for a romantic trip , where would you go? me---Paris. And you?
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I would move there just for the pleasure of of once again having a piece of Dobosh torte and a strong cup of coffee in a little café.
(deep in the Swiss Alps with gorgeous views of the Matterhorn!). Tell, me that is not "snuggle"-conducive!
(Just don't injure yourselves on the slopes on day 1! )
But, yeah, Paris would be a good option too. 
My library has videos of train trips around the world. There are so many! The Blue Train in South Africa...oh my. Australia & Mexico have nice ones, too.
We were hiking early one morning in the foothills of Boulder & I kept hearing what sounded like a vehicle behind me & kept looking back, but of course there wasn't a car or truck on the trail, but the noise got louder & I finally looked up & saw the silver Zephyr going up the mountain above me. It looked like a giant caterpillar climbing the side of the mountain.
All aboard! 
When I retired, I donated my frequent flyer miles to Make A Wish.
I don't remember my American or Delta numbers, but my United miles were a pinch over 2.5 million.
A year or so ago, my wife says "Maybe we should go to Italy before we get too old."
Out of curiosity, I checked the United website. 125k miles & a $120 service charge is a 1st class ticket to Rome.
10% of my miles & $240 would have gotten us to & from Rome 1st class.
I told her "Something you might have mentioned before I donated all my miles!" 
As I haven't flown coach since the early 90s, I'm not starting now, and I'm way too cheap to spend money on 1st class tickets.
So, it's STRICTLY a dream.