Well I remember looking into it. Their claim to fame is
http://travel.travel
You could only reg one domain, the name of your company as opposed to say, rome.travel or hawaii.travel or space.travel
and you needed to turn in paperwork, or belong to one of the 2 main travel associations to even qualify to pay your $100 reg fee.
Next time some genius proposes some TLD like .museum let someone cite this as an example of why not to bother.