The Corryvreckan Maelstrom. Scotland
Scotland’s most dangerous tourist attraction is only for the brave. The whirlpool lies between the isles of Jura and Scarba in the Inner Hebrides and is considered to be unnavigable by the Royal Navy, though some have tried it. An underwater mountain creates the whirlpool, the third largest in the world, and causes water to rush in towards a 200m pinnacle of rock in the narrow Jura strait, the peak of which sits only 30m from the surface, creating the violent phenomenon. George Orwell once tried to test its reputation and barely made it out alive.