Skyscraper

A skyscraper is a very tall building.

Inside, a strong metal frame holds the weight. This frame lets builders add many large windows. These windows let in lots of light.

Many tall buildings are in Asia now. China has more of them than the United States.

A skyscraper is a very tall building.

Most skyscrapers use a steel frame. This is a strong metal skeleton. The frame holds up the whole building. This means the outside walls do not have to carry the weight. We call these curtain walls. Because the walls are light, builders can add many large windows.

Modern buildings often use a tubular structure. This means they are shaped like a hollow tube. This shape helps them stand strong against wind.

Skyscrapers first appeared in the United States. They became popular in Chicago and New York City. The Home Insurance Building was one of the first. It used a steel frame in 1885.

Today, many tall buildings are in Asia. China has more skyscrapers than the United States. The city with the most is Hong Kong. The tallest building in the world is the Burj Khalifa. It is in Dubai.

A skyscraper is a very tall building with many floors for people to use. People use these floors for offices, hotels, homes, or shops. They are common in large cities across the Americas, Asia, and Australia. Builders often make them when there is a high demand for space. However, there is not much land available to build on. This makes building upward a smart way to use the ground.

Most skyscrapers work using a strong steel frame. This frame acts like a skeleton that supports the whole building. Instead of heavy stone walls carrying the weight, builders use curtain walls. These walls hang from the frame or rest on it. Because the walls are not carrying the heavy weight, they can be made of glass. This allows for large windows that let in lots of light.

Tall buildings first appeared in the United States during the late 19th century. Many of them were built in Chicago and New York City. The Home Insurance Building in Chicago was a very important early example. It was finished in 1885 and used a steel frame. This building was about 42.1 meters tall at the time. It also used things like elevators and electrical wiring.

Building tall structures has a long and interesting history. In the 1700s, a building called The Flaxmill used iron frames. This helped lead to the modern steel frames we see today. In 1857, Elisha Otis made the safety elevator. This invention made it easy to reach the top floors safely. Without the elevator, living in a very tall building would be much harder.

Today, skyscrapers are found in at least 70 different countries. China now has more skyscrapers than the United States. The city of Hong Kong has the most with 569 tall buildings. In Dubai, you can find the Burj Khalifa. This is currently the tallest skyscraper in the entire world. Many more of these giant buildings are being built in the 21st century.

A skyscraper is a tall building with many habitable floors. These structures serve many purposes, including offices, hotels, residential spaces, and retail areas. While there is no single universal definition, most modern sources describe skyscrapers as very tall high-rise buildings. Many organizations use specific height limits to classify them. For example, Emporis defines a skyscraper as a multi-story building at least 100 meters tall. Buildings taller than 600 meters are called supertall, and those over 800 meters are called megatall.

The way a skyscraper stays standing is quite different from a regular house. In conventional construction, thick load-bearing walls carry the weight of the building. In a skyscraper, a steel frame acts as a skeleton to support the structure. This frame supports curtain walls, which are the outer layers of the building. These walls either hang from the framework above or rest on the framework below. Because the curtain walls do not carry the weight, they can be made of large glass surfaces.

Engineers must also design skyscrapers to handle lateral loads, which are side-to-side forces. These forces come from wind and seismic activity, such as earthquakes. Many modern skyscrapers use a tubular structure to resist these forces. This design allows the building to act like a hollow cylinder. To help with stability and light, many designs include setbacks. Setbacks are areas where the building's width decreases as it goes higher. These steps help the building appear more slender and allow more daylight to reach the ground.

Humans have tried to build tall structures for a very long time. The Great Pyramid of Giza was the tallest structure for thousands of years. In the 19th century, the Eiffel Tower became the first supertall structure. However, these were not skyscrapers because they were not meant for living or working. The modern era of skyscrapers began in the United States during the late 1800s. Cities like Chicago and New York City led this movement. The Home Insurance Building, completed in Chicago in 1885, is often cited as the first largely steel-frame skyscraper.

Several key inventions made the skyscraper possible. In 1857, Elisha Otis introduced the safety elevator. This allowed people to travel to high floors conveniently and safely. Without elevators, the upper floors of tall buildings would be difficult to use. Another major step was the development of the steel skeleton. Before this, buildings used load-bearing masonry, which reached its practical limit in 1891. The Flaxmill in England, built in 1797, used iron frames and is sometimes called the "grandfather of skyscrapers."

Skyscrapers are now a global phenomenon found in at least 70 countries. While they were once mostly an American feature, they are now very common in Asia. China has overtaken the United States as the country with the most skyscrapers. Over seven thousand skyscrapers taller than 150 meters exist worldwide. More than three-quarters of these are located in Asia. Many of these massive buildings were constructed during the 21st century.

Different cities hold records for their tall building populations. Hong Kong has the most skyscrapers in the world with 569. Shenzhen in China follows with 465. New York City has 324, and Dubai has 269. As of 2025, twenty cities have at least one hundred skyscrapers taller than 150 meters. These include Singapore, Hangzhou, Moscow, and Toronto. The tallest skyscraper in the world is the Burj Khalifa, located in Dubai.