The 10-mile-long island of Schiermonnikoog is known as one of the most beautiful places in the Netherlands, boasting the widest beach in Europe, 300 different species of birds and a bustling tourist trade.The 10-mile-long island of Schiermonnikoog is known as one of the most beautiful places in the Netherlands, boasting the widest beach in Europe, 300 different species of birds and a bustling tourist trade.