Did you know that the tallest building in the world, the Burj Khalifa in Dubai, stands at a staggering 2,717 feet (828 meters) tall? Completed in 2010, this magnificent structure has 163 floors and took over 13,000 workers to construct. It also holds the record for the most stories in a building globally. One of the world's most famous bridges, the Golden Gate Bridge in San Francisco, is not actually made of gold! It got its name from the Golden Gate Strait, the entrance to the San Francisco Bay from the Pacific Ocean. Opened in 1937, this iconic suspension bridge spans 4,200 feet (1,280 meters) and has a distinctive orange color. The Great Wall of China, a marvel of ancient engineering, stretches over 13,000 miles (21,196 kilometers). Built over centuries by various dynasties, it served as a defensive barrier against invasions. Contrary to popular belief, it is not visible from space without aid, due to its width and color blending in with the surrounding landscape. The Roman Colosseum, a masterpiece of Roman architecture, was completed in AD 80. It could hold up to 80,000 spectators who came to watch gladiator fights and other spectacles. This historic amphitheater is a symbol of the grandeur of the Roman Empire and continues to attract millions of visitors each year.