An unprecedented cold front has frozen parts of Niagara Falls, drawing tourists to document the rare event. The minus 22-degree weather didn't stop iReporter Spencer Wyllie from capturing the beauty of the falls on Thursday. Spencer Wyille/CNN iReport

"Most of the buildup is on the American and Bridal Veil Falls," said Wyllie. Spencer Wyille/CNN iReport

Professional photographer and iReporter Dave Perry went to see the frozen wonderland on Thursday. He said it was "so cold I wondered why I was taking photos here but the scene makes it worth the trek." Dave Perry/CNN iReport

Perry also trekked to the falls Monday, when he spotted some unusual frozen formations. Dave Perry/CNN iReport

The Burlington, Ontario, resident walked along the edge of the falls, where he saw the American side glistening with ice. Dave Perry/CNN iReport

Only after taking a series of photographs did he realize the falls were frozen. "It didn't strike me at first when I took this shot," Perry said. "I thought it looked like teeth, like a monster's smile." Dave Perry/CNN iReport

Perry and dozens of tourists from America and Canada are making their way to see the frozen scene. Dave Perry/CNN iReport