If you want a really strong relationship - I recommend moving abroad. It needs to be a country where neither partner can a) speak the language b) has lived before.
This, in my experience, will be a little crazy – for example if will make even the simplest task; like talking to a plumber fraught with possibilities to get the wrong end of the stick, you won’t have a family or friends network to rely on, and everything will be an uphill struggle.
But.. you will probably have a rock solid relationship with your wife. After a few years you will be able to guarantee they can take just about anything in their stride. Travelling to other parts of the world will be a breeze – and going back to your home town will bring a smile to your face when you have to sort something mildly problematic there.