Unique structures refer to buildings or constructions that stand out due to their distinctive design, materials, or purpose. These structures often reflect the creativity and innovation of architects and builders, showcasing a variety of styles that can range from modern to traditional. Examples include the Eiffel Tower in Paris and the Sydney Opera House in Australia, both of which are celebrated for their iconic shapes and engineering. Such structures can serve various functions, including residential, commercial, or cultural purposes. They often become landmarks in their respective cities, attracting tourists and inspiring local pride. Unique structures can also represent advancements in technology and sustainability, as seen in eco-friendly designs like the Bosco Verticale in Milan.