1: 1. The Twelve Apostles, Australia - Iconic limestone stacks along the Great Ocean Road.

2: 2. Ayers Rock (Uluru), Australia - Sacred sandstone monolith in the Outback.

3: 3. Giants Causeway, Northern Ireland - Basalt columns on the coast of Antrim.

4: 4. Stonehenge, England - Ancient circle of standing stones in Wiltshire.

5: 5. Moeraki Boulders, New Zealand - Massive spherical rocks on Koekohe Beach.

6: 6. Bryce Canyon, USA - Spectacular hoodoos formed by erosion in Utah.

7: 7. Ha Long Bay, Vietnam - Thousands of limestone karsts in the Gulf of Tonkin.

8: 8. Arches National Park, USA - Natural stone arches in Utah's red rock country.

9: 9. Mount Roraima, Venezuela - Tabletop mountain with sheer cliffs and cascading waterfalls.

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The 20 Most Famous and Amazing Rock Formations in the World