New Smyrna Beach
New Smyrna Beach, in Volusia County, Florida, is a great place to surf . . . and to swim with sharks. The waters off New Smyrna possess large populations of fish, which in turn attract many sharks.
Bubbly Creek – Chicago River
Meatpacking waste including blood, manure, urine, and various body parts was dumped into the channel by the nearby Union Stockyard for over a century. Bloodworms are said to inhabit the creek, feeding on the waste.
The gas levels at the lake fluctuate unpredictably. A family could have a picnic on the lake one year and be asphyxiated the next. Warning signs are posted around Horseshoe Lake to inform visitors of the danger. Carbon dioxide is heavier than air, making lower areas such as depressions in the ground, or the shore and surface of the lake much more dangerous.
Eagle’s Nest Sinkhole
From ground level, it appears to be nothing more than a pond, but narrow shafts at the bottom of the pond lead into a much larger underwater cave system with over 2 kilometers (1 mi) of charted passages, rooms larger than a football field, and shafts no wider than a doorway.
There are powerful rip currents capable of pulling even strong, experienced swimmers out to sea. These rip currents are almost always present, as there is no reef to protect the beach’s shores. Also, the geography of the region is such that the nearest safe beach is 10 kilometers (6 mi) away. There is simply nowhere to go.