There are many purpose-built vehicles in the world. Some are designed to join the 200 mph club; others are meant to just take us around town. Then you have cars built with one goal in mind: to be seen ...

This German helmet, from the mid-16th century, has a rather unusual adornment on its mask. Was the wearer known as the Cock Knight? The six-pound, six-ounce helmet resides in the Metropolitan Museum ...