• Tagged algae, algal blooms, bioluminescence, ecosystem, environment, harmful algal blooms, phenomena, phenomenon, Red Tide, science

While you might not stop to think on it, water is full of algae and aquatic microorganisms that play a vital role in marine and fresh-water ecosystems. Not all algae is harmful, but when microscopic algae grows too quickly, then it can cause a phenomenon commonly called “red tide.” Scientists prefer the term algal blooms. Not all of these “red tide” algal blooms are red or dangerous, some even appear to glow with bio-luminescence, but harmful algal blooms can poison shellfish, fish or other wildlife. It’s no longer cool to call these “red tides” because red tides are very often not red; many have no discoloration at all. Red tide also is not the same thing as the wide variety of algal bloom species that are often mistakenly called red tides. Yet when the water appears blood red, which is rare, and dead fish are floating on the surface or the beach, then it freaks people out and rumors start flying about the “end of the world.” There are varying opinions about if it is “safe” to swim in a “red tide” which often comes in a rainbow of algal bloom colors . . . and shades of harmful algal bloom. Would you swim or fish in these waters? [38 Photos]

• Tagged abandoned, archaeological, architecture, coastal fortress, coral reefs, diving, DRTO, Dry Tortugas, Dry Tortugas National Park, ecosystem, environment, Florida, fort, Fort Jefferson, Garden Key, ghost town, island, islands, Key West, lighthouse, Loggerhead Key, marine life, National Park, nature, sea, shipwreck, shipwreck diving, snorkel, sunken treasure, treasure hunting, wreck diving

About 70 miles west of Key West, Florida, lies Dry Tortugas National Park which is world-renowned for picturesque blue sea waters, white sands, brightly colorful coral reefs, abundant marine life, and legends of shipwrecks and sunken treasures. There are seven small islands in the 100-square mile park, but it is mostly open water that is accessible only by boat or seaplane. Dry Tortugas is also famous as the home of magnificent and historic Fort Jefferson, the largest masonry building in the Western Hemisphere. Though it was not finished, the fort has more than 16 million bricks that make up the massive 45-foot-high, three-level hexagon, coastal fortress that has 2,000 architecturally beautiful arches. [44 Fabulous Photos]

• Tagged Brazil, Chapada dos Veadeiros, Chapada dos Veadeiros National Park, ecosystem, environment, Moon Valley, National Park, photos, pics, pictures, Valley of the Moon, waterfalls, World Heritage Site

Chapada dos Veadeiros in Brazil is one of the oldest, most beautifully diverse and unusual tropical ecosystems in South America. The National Park has over 161,891 acres (65,515 hectares) of gorgeous landscape full of exotic flora and fauna, lots of spectacular waterfalls, bizarre rock formations, caves and grottoes. According to NASA, when observed from outer space, the Chapada’s high plateaus are the most luminous point visible on Earth; this bright glowing is caused by the reflection between the sun and the abundance of quartz crystal in the region. On private property close to Chapada dos Veadeiros National Park is an amazing and ancient place much like a water park created by nature with pools, natural water slides and cascades. It’s called Vale da Lua or Valley of the Moon due to the smooth rocks formed by river and ancient lava flows. Still others call it Moon Valley. These rocks are very weird and some consider them to be like lunar rocks, but the place is a treasure. This Moon Valley is not well-known, not even among the people of Brazil. Here are 43 photos of beautiful Chapada dos Veadeiros National Park and the unique Vale da Lua or Moon Valley in the Brazilian Highlands. [43 Photos]