Throughout the nineteenth century, the Niagara Falls formed America’s greatest tourist attraction and the continent’s most popular honeymoon destination. It was marketed as a place that "appeals to those seeking an intense emotional or spiritual experience in the face of Nature’s power". Even in winter the river never stops flowing, but the mist and water create ice formations along the banks that sometimes form an ice bridge across the river. Until 1912 tourists were allowed to walk on the ice to see the falls from below. Many photographers, both on the Canadian and the American side, have produced views of this impressive sight. One of them, a Scots Canadian called William Notman (1826-91) has sometimes been credited with this particular work.