A UNESCO World Heritage Site of mythical beauty, Ha Long Bay spreads across 1,553 square kilometers of emerald waters dotted with nearly 2,000 towering limestone karsts and islands draped in jungle vegetation. According to legend, a dragon descended from the mountains and spat out jewels that turned into the islands, creating a natural fortress against invaders. Today, traditional wooden junk boats glide through this labyrinth of stone pillars, weaving past floating fishing villages where families have lived on the water for generations. Hidden within the karsts are enormous caves adorned with stalactites and stalagmites — Sung Sot Cave alone stretches across two massive chambers. Kayaking through natural archways into hidden lagoons reveals a quieter, more intimate side of the bay that cruise passengers rarely see.

Pro tip: Skip the overcrowded Ha Long Bay day trips and book a two-day, one-night cruise through the less-visited Lan Ha Bay or Bai Tu Long Bay instead — same stunning scenery, a fraction of the boat traffic.