Watching phytoplankton illuminate the world's shores is an otherworldly experience. With a bit of luck and perseverance, ...

The night is cool, still, almost silky, and I could stay in this moment forever, but from a nearby boat I hear the guide urge ...

via Wikimedia Commons Dinoflagellates, a type of plankton, bring the ocean’s surface to life with their shimmering glow. When disturbed by motion, these microorganisms emit light, creating sparkling ...

Here are some bioluminescent animals you must see: Black dragonfish are deep-sea predators with sharp teeth and ...

Spanning 27 acres, Castillo San Cristóbal was built to protect Old San Juan from land attacks. It doesn't receive as many visitors or as much adoration as its sister fortification, El Morro, but ...

The resort beaches in Condado and Isla Verde are beautiful, but if you tire of the same old scenery, take a 30-mile drive east from San Juan along Route 3 to Luquillo Beach. Families flock to this ...