U.S. citizens Thursday are celebrating their annual Thanksgiving holiday - a centuries-old harvest time tradition.
For the day of feasting that usually kicks off the winter holiday season and triggers one of the busiest travel weeks of the year, Americans take to the air, railways and roads to visit family and friends.
The meal usually includes turkey or ham, vegetables, and pies made of fall-harvest fillings such as apple or pumpkin.
After the feast, some people engage in recreational activities such as watching or playing sports. Others will take a nap.
