Cologne Cathedral, in Cologne, Germany, completed construction in 1880. Building had started in 1248. However, work was suspended in 1473. Centuries later, construction started again. A World Heritage Site, the cathedral hosts about 20,000 visitors per day. Children could learn more about the Cologne Cathedral at the World Heritage site: http://whc.unesco.org/en/list/292.
Incandescent light bulb was patented by Thomas Edison in 1880. The patent number is 223898. Idea: In a drawing a light bulb above someone’s head indicates the person has developed a new idea. Children could draw light bulbs. They could surround the light bulbs with ideas of their own for new inventions. They could see his patent at: Light Bulb Patent.