Do you have a fear of heights? If so, you might want to avoid a new bridge in the European country of Portugal. The Ponte 516 Arouca is a whopping 1,692 feet long. That makes it the longest suspension footbridge in the world. Its floor is a see-through metal grid, so people who cross it can see straight down to a river 570 feet below. Though the bridge is supported by sturdy steel cables, people still feel it wobble with every step. Would you cross this new bridge?