CTA train on the Loop track which runs above ground in downtown Chicago, Illinois, United States of America, North America

A teenager driving a ground loop on his mountain bike, Downhill Park, Wagrain, Austria

Aerial view, Porta Westfalica, Grosser Weserbogen river loop, Weser river, Minden-Luebbecke, Ostwestfalen-Lippe, eastern Westphalia, North Rhine-Westphalia, Germany, Europe