Queensland and Northern Territory, Australia
dany13 via Flickr
Whitehaven Beach, located in the Whitsunday Islands of Queensland, Australia, is one of the most beautiful beaches in the world, to the extent that it almost looks like a painting. But this beach, along with most of the rest of the coastline of northern Australia, hides a deadly secret: It's positively infested with box jellyfish, locally known as "stingers," which are one of the deadliest animals in the world. Just one sting can send you to your grave, so if you do get in the water here, make sure you're within safety nets.
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Kilauea, Hawaii
TJ Takahashi via Wikimedia Commons
Unlike in South Africa and northern Australia, where danger is hidden behind a veil of beauty, it's pretty immediately obvious why you shouldn't go for a swim in Kilauea, Hawaii. If you do want to get an up-close look at the constantly-erupting volcano, who lava literally forms new land as it cools and hardens in the sea, contact a local tour operator.