The majority of those lucky enough to have visited a beach in their lifetime will have experienced what is essentially a common sight at the coast; a strip of golden sand; a few dozen sunbeds; calm blue sea and clear skies. Of course, things aren't always normal depending on your location. Here are some incredible, uncommon sights at the beach. Haeundae Beach Image Source Haeundae Beach in South Korea is not the place to go should you be looking for a peaceful bout of sunbathing, as the mile long stretch of sand is apparently the world's most populous during summer months. As illustrated by the claustrophobia-inducing photo, over 100'000 people have been known to fill the beach simultaneously at its peak. More pictures are here. Cappuccino Coast Image Source In August 2007, visitors to the the coast of Yamba, New South Wales - especially Main Beach - were treated to a case of sea foam so extreme that the majority of onlookers were completely baffled. Caused by 'impurities in the ocean', this particular case of what is actually a common event was further intensified by storms just off the coast which whipped up the foam to the extent seen in the photo above. More can be seen here. Seagaia Ocean Dome Image Source At first sight the beautiful, inviting beach shown in the photo above seems as normal as most. In truth though, it's entirely man-made, and indoors. The building in which it resides was, prior to its closure in 2007, called Seagaia Ocean Dome and located in Japan proudly held the title of 'world's largest indoor waterpark'. An engineering masterpiece. Red Tide Image Source Surprisingly, the red water seen sweeping towards the beach in the photo above is entirely natural, and the result of a very often harmful onset of Algal Bloom; a phenomenon in which algae accumulate in a body of water to such a degree that its colour actually changes. Visually stunning, but potentially dangerous. Duck! Image Source Had countless similar photos not circulated the internet over the past few years, it would be easy to dismiss this picture as fake, but of course it isn't, and still deserves mention. The beach pictured can be found on the island of Saint Martin in the Caribbean, and is unfortunately located directly underneath the landing path of planes approaching Princess Juliana International Airport. If you haven't already done so, I strongly suggest a visit to Youtube for video footage. Couple Image Source As you sit on the beach in Newbiggin-by-the-Sea, England and look out at sea, you will no doubt notice two enormous characters - each five metres in height - standing above the water on a frame. The permanent sculpture, entitled 'Couple', was created by artist Sean Henry and has been puzzling tourists since 2007.