the later castles were created out of stone but were then made out of concrete.
Early castles were made of wood, and were built on small hills. Later castles were usually made of stone, though when a castle was needed quickly it might still be made of wood, and some castles were made of brick.
motte and bailey castles were the first castles built by william and later stone castles came around they were first rectangular but then were made circular which was better defence. e.t.c. ;-)
It was stronger the wood
a u shaped castle
no. rulers in ancient Greece lived in palaces (with lots of columns and marble) castles are from the medieval Europe period and developed much later
The early castles along the English -Welsh border were built by the Normans to protect their newly acquired country. 300 years later more castles were built by Edward I as part of his efforts to conquer Wales.
The castles I have been to have had varied types of stairs. Some are made from stone and they get more narrow as you get closer to the top. The later castles have wide broad stairs and they were designed to accommodate the women's dresses with a bustle. The Mott and bailey castles had wooden stairs that were rather narrow and not well made.
Wood mainly. Just an outer wall with an entrance and a small fort inside. This type of castle would have been called a motte and bailey castle. Motte and bailey castles were later replaced by concentric castles made out of stone.
Motte and Bailey castles were not as good as other castles as they were weak. They were made of wood which could be easily battered and set alight. William the Conqueror built them because the could be produced quicker than other castles. He did this to assert his authority over England without taking too much time. They were later replaced by stone ones.
Castles were not always stone, but were always fortified for protection. Early on in the Middle Ages, they were made of wood and earthworks; they could be built quickly and inexpensively, but they did not last very long and were easier to defeat than later castles. The later castles were usually made of stone, and were stronger. Where stone was not available, brick was often used, and where a castle was needed in a hurry, the old wood work could still be used. I think the Wikipedia article on castles is a pretty good source of information. There is a link to it below.
Motte and Bailey castles were built in the 11th century just after King William I (Willilam the conqueror) first took over Britain in 1066. Motte and Bailey castles were made out of wood. They were mainley built because they were cheap and light so they were easy to build. They were later replaced by Stone keep castles (Stone castles) because Stone castles were stronger, wouldn't rot within a few years, wouldn't burn etc...