Paper bridge: American scientists have developed a unique paper bridge. The span of the bridge is 15 meters, the width is 3 meters, and it can pass a car weighing 3 tons. The parts of the paper bridge are made of corrugated paper, each 30 centimeters square. This paper is mixed with metal fibers and is extremely strong. It can withstand 420 kilograms of pressure when placed on its side.

Mud Bridge: In Nicaragua, Latin America, there is a bridge made of mud. The bridge is 2.7 meters high, 1.2 meters wide, and weighs more than 1 ton. According to historical records, the bridge was built in 876 AD and is still intact today. It turns out that the bridge is made of a special kind of clay that the locals call fire clay. Fire clay is red in color. After solidification, it is like iron and steel, and it does not deform under wind and rain.

Grass bridge: The Indians in the Apu Primac Island of Peru still like to use a kind of grass to build bridges. April is the rainy season every year. The Isu grass here grows so luxuriantly that people twist it into ropes and build a bridge that can last for two years in three days.

There is also a grass bridge more than 30 meters long on the Chesi Morage River in Africa. On both sides of the river, there is a kind of aquatic plant called "Purple Miaocai". Its branches and leaves are tough and luxuriant. They extend and climb each other across the river, forming a strong grass belt layer, just like setting up a pontoon bridge on the river.

Tree Bridge: The only bridge in the world made by artificially processing leaves, located in Guizhou Township, Shunde County, Guangdong Province, my country. The bridge deck is a very thick banyan tree root. What’s interesting is that there are railings stretched out by the tree roots at a height of 70 centimeters from the bridge deck. According to legend, 200 years ago, people planted this banyan tree next to the stream. After it grew a little, the three roots exposed on the soil surface were artificially pulled to make it spread to the other side. Over time, it grew into this tree. A unique living tree root bridge.

Long Vine Bridge: There is a soft bridge made of 42 long vines in Guinea, West Africa. When people walk on it, the bridge will become curved, making people feel as if they are above the clouds and have an ecstatic feeling.

Flower Bridge: There is a Flower Bridge in Mainz, Germany. The bridge deck is like a garden. There are various flower beds with flowers and green grass, as well as benches for people to rest.

Plastic bridge: American scientists have developed a plastic bridge with a span of 30 meters that can pass light vehicles and tourist vehicles. It is made of engineering plastics with high strength, light weight and elasticity. One end of the bridge deck is fixed on the shore, and the other end can be rolled out and rolled up like a carpet. This kind of bridge is flexible and easy to use without affecting the normal navigation of ships on the river.

Nylon Bridge: A unique nylon bridge spans the Nisava River near Sofia, the capital of Bulgaria. It is composed of 6 trapezoidal nylon beams, each beam is 14 meters long. The bridge is paved with asphalt pavement. The total weight of the bridge itself is 8 tons, which is only one-sixth of the reinforced concrete bridge. Compared with ordinary bridges, it has the characteristics of long life, strong elasticity, light weight, and not afraid of corrosion, but it is only suitable for pedestrians.

Tile Bridge: A new type of bridge built with large tiles is erected over a river in the ancient capital of Spain, Villaville. Its biggest advantage is that it is not easily contaminated by dust and will be as clean as new after being washed away by rain.

Music Bridge: There is a Music Bridge in Aichi Prefecture, Japan. The bridge is 31 meters long and 2 meters wide. When pedestrians cross the bridge, they only need to tap the pillars on the railings in sequence, and it will play a complete piece of music. .

Inflatable bridge: It was first developed by American scientists. After the bridge is inflated, it can pass 180-ton trucks.

Snake Bridge: There is a village called Pangcona in the Milange region of Mozambique, where a very peculiar kind of twisted snake is abundant. They like to gather in groups and twist together, pulling and pulling across the river, and they are used to tightly wrapping the two ends around the thick tree trunks on both sides of the river, thus forming a natural "snake bridge". When pedestrians walk across the "Snake Bridge", not only will they not overturn them, but they will also become more entangled with each other, allowing people to pass on it without incident.