Sydney's sandstone formed 220 million years ago and shapes everything from the Royal National Park's coastal cliffs to the QVB. A guide to the geology behind the city and its surroundings.
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Hanging Rock in the Blue Mountains is a sandstone formation cantilevered above the Grose Valley — a 10km return walk from Blackheath with dramatic cliff-edge views. Suitable for guests comfortable with heights.
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The Blue Mountains glow worm tunnel near Lithgow — a disused railway tunnel where bioluminescent larvae light the walls in complete darkness. One of the more unusual stops on a Blue Mountains day.
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The Zig Zag Railway near Clarence runs heritage steam trains through sandstone cuttings and across 19th-century viaducts. Operates around six days a month — can be included on a Blue Mountains private tour.
Read MoreThe Megalong Valley is the quieter, less-visited side of the Blue Mountains. A guide to Govetts Leap, Bridal Veil Falls, Cliff Drive lookouts and Boars Head Rock — with views most visitors never find.
Read MoreThe Royal Botanic Garden at Mt Tomah sits 1,000 metres above sea level on the Bells Line of Road. Cool-climate plants, Wollemi pines, sweeping lookouts and the quiet village of Mt Wilson — a different way into the Blue Mountains.
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