While every birthday is cause for merriment, milestone birthdays necessitate a bit more pomp and circumstance. For many, it can feel like a big deal to enter into a new decade. Energetic and lively destinations like New Zealand and Spain are great for when you’re in your twenties. Cultural tours through India or Thailand are perfect for exploring in your thirties. Luxury ranches in Montana, private tours in the UAE, and brand-new properties in Singapore are just the thing for well-heeled folks in their fifties. Of course, Paris and Vienna are always a good…
