the siege tower
Cannon .
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the invention of the cannon
Invention of the pendulum clock
Because Gunpowder made the walls obsolete as a means of defence.
With the invention of the computer, typewriters were made obsolete.
it was obsolete by the invention of the gun
Many castles had moats, steep embankments or other natural defenses. Castle defense was often a matter of waiting out the attackers - many castles had their own water supply. Artillery, which could destroy walls, made castles obsolete.
To hard and costly to make.
Castles ceased to be built due to gunpowder being introduced to the Europeans from China and the invention of cannons, which resulted in castles being easily destroyed and the occupiers defeated. Castles ceased to be built due to gunpowder being introduced to the Europeans from China and the invention of cannons, which resulted in castles being easily destroyed and the occupiers defeated.
Castles served a number of purposes, but their primary reason was fortification. The introduction of the cannon onto the battlefield effectively rendered castles obsolete for fortification purposes.
Invention of copper and bronze made pretty much every stone tool at the time obsolete.
I am aware of none. After the introduction of gunpowder, castles became obsolete very quickly. However, they were replaced by forts made of natural stone, artificial stone, compacted earth, wood, or a combination of these.
America's Castles Age of Invention - 1995 TV was released on: USA: 9 April 1995 (www.aetv.com)