The Blue Mountains, located just west of Sydney, Australia, are renowned for their dramatic scenery and unique geological features. This World Heritage-listed area is known for its ancient sandstone cliffs, deep gorges, and eucalyptus forests, which give off a distinctive blue haze. Indigenous Australians, particularly the Darug and Gundungurra peoples, have inhabited the area for thousands of years. European exploration began in the early 19th century, with Gregory Blaxland, William Lawson, and William Charles Wentworth successfully crossing the mountains in 1813. Today, the Blue Mountains are a popular destination for outdoor activities, including hiking, rock climbing, and sightseeing at landmarks such as the Three Sisters and Wentworth Falls.