Did you know that the Petronas Towers in Kuala Lumpur, Malaysia were the tallest buildings in the world from 1998 to 2004? Designed by Argentine architect Cesar Pelli, these iconic twin towers stand at 1,483 feet tall and are connected by a skybridge on the 41st and 42nd floors. Another famous landmark is the Sydney Opera House in Australia, designed by Danish architect Jørn Utzon. Its unique sail-like roof design has made it one of the most recognizable buildings in the world. Completed in 1973, the Sydney Opera House is a UNESCO World Heritage Site and hosts over 1,500 performances annually. Moving to Europe, the Eiffel Tower in Paris, France is one of the most visited landmarks in the world. Designed by Gustave Eiffel, this iron lattice tower stands at 1,063 feet and was completed in 1889 for the World's Fair. Despite initial criticism, the Eiffel Tower has become a symbol of France and a testament to modern engineering. These architectural marvels are just a few examples of the creativity and innovation found in the field of architecture and civil engineering. From skyscrapers to opera houses, these buildings continue to inspire and captivate people around the globe.