16. To Sua Ocean Trench – Samoa

A natural swimming hole like no other, To Sua is a massive sinkhole filled with emerald water. Surrounded by lush gardens, it feels like diving into another world. A wooden ladder leads adventurous swimmers down to the water’s surface, where the experience is equal parts thrilling and serene. Visit early to enjoy it without crowds and capture incredible photos. It’s the ultimate off-the-beaten-path spot for travelers seeking something extraordinary.