

Tucked away in a rural corner of Northern Alabama you’ll find Dismals Canyon, a National Natural Landmark home to the oldest accessible primeval forest east of the Mississippi River (ie a forest that has existed without any significant event, such as a fire or storm, affecting its growth). Head into the gloom of Alabama's Dismals Canyon for a glowworm light show © Rommel Stribling / Alamy Dismals Canyon, Alabama Puerto Rico’s 5 best road trips serve up tasty snacks, beautiful beaches and stunning views Post-glow activities: After soaking up the night-time magic of the bay, take advantage of the Caribbean sun – head to the mile-long golden arc of sand at Sun Bay to take in some vitamin D and admire the turquoise sea. For the best view, book your trip on a new moon. The glow was somewhat dimmed after Hurricane Maria, but the sparkling waters have bounced back to pre-hurricane levels. Note that the phenomenon is notoriously difficult to capture on camera, so just enjoy the magic instead. Watch fish jet out from under your boat like shooting stars, and elect for a glass-bottomed kayak to pretend you are in warp drive as you glide across the surface.

Mosquito Bay has long held the title of the brightest bioluminescent spot in the world, and for good reason – millions of single-celled organisms called dinoflagellates glow bright blue when disturbed, creating a mind-blowing spectacle for those who venture out on the water via kayak. Puerto Rico is home to three bioluminescent bays, the most spectacular of which is Mosquito Bay on Vieques, a small island off the east coast.

Mosquito Bay teems with microscopic creatures called dinoflagellates, which emit light when the water is disturbed © David Liittschwager / Alamy Vieques, Puerto Rico
