My fiancé and I had this conversation pretty early in our relationship. The first time I visited him, his mother told me that she wanted desperately to go to Italy, but that her husband wouldn't go. She went there on holiday with friends when she was young, and she'd been waiting 40 years to return. DF's father is something of a homebody, and he just wasn't interested in going. I asked her why she hadn't gone on her own, and she said that her husband wouldn't like it. I encouraged her to find a way to do these things that she wanted to, because I could feel her bitterness.
DF is a homebody, much like his father. That evening, I told DF that I have the travel bug, and I was going to travel. I told him that I would be more than happy to have him come with me on my trips, but I will go with or without him.
Honestly, he doesn't seem overly keen on the idea, but I'm not overly keen on foregoing travel. He takes the "default" position on a lot of the things we disagree on, which means that if I waited until we both agreed before acting, he'd get what he wanted solely because his desires don't require any action. I will always take his desires into account, but I won't let them overrule mine.
That being said, he has always been very supportive of individual travel opportunities when they've arisen. He encouraged me to apply for a scholarship to study Arabic in the Middle East (which I regrettably did not get), and he is supportive of my plans to backpack with friends.
DF's mother did eventually decide that she wants to travel with or without her husband. She hasn't made it back to Italy yet, but she's taken many small trips to different places in Europe without her husband, as well as one big trip to America with him (and DF). DF says that his father still isn't keen on her taking these trips, but he agrees that his father has adjusted fine, and she is much happier.