Blackletter is an ornate typeface style which was widely used in Western Europe in the 12th through the 17th century. Sometimes the ancient style is still used for newspapers and books. Other names for this style are Old English, Fraktur, Gothic script, Textura and Gothic minuscule.
Blackletter can be hard to read. There are very few curves, and many points.
It is ironic that Blackletter, which was the typeface used for the Gutenberg Bible, was later adopted by—and then rejected by—the Nazis. It has also been popular with bikers and heavy metal rockers.
(From my upcoming No More Ugly Books!)