1. The Alps?
At 1,922 metres (6,306 ft), Mount Feathertop in the Australian Alps is the second-highest mountain in Victoria. Covered in snow from June to September, it's popular with back-country skiers and snowboarders.
2. The Rockies?
Tasmania's landscapes feature more exposed dolerite than anywhere else on Earth. Dolerite is the rock that shaped the jagged and mountainous landscapes which have made Cradle Mountain-Lake St Clair National Park world famous.
3. The Pyrenees?
Rising out of the bush in outback SA, the spectacular Flinders Ranges are the product of millions of years of erosion, perfectly summarised by the German-born Australian artist Hans Heysen as “the bones of the earth laid bare”.
4. The Rainbow Mountains, China?
The highlight of Western Australia's Purnululu National Park, the 350 million year old Bungle Bungle Range has been an important spiritual place for Indigeous Australians for 40,000 years, but was only "discovered" by the outside world in 1983.
5. The Sierra Nevada, California?
The six day 224km Larapinta Trail along the MacDonnell Ranges is one of Australia's great wilderness treks. One of the highest peaks in Australia's Red Centre, 1,389m (4,555ft) Mount Giles dominates Ormiston Pound, a spectacular ring of mountains.
6. The Sierra Nevada, Andalucia?
Bluff Knoll in Western Australia's Stirling Range National Park is one of the few places in WA to experience regular winter snowfalls. 1,099 metres (3,606 ft) above sea level, the region's Aboriginal name is Koi Kyeunu-ruff: "the place of ever moving fog and mist".
7. Victoria Falls, border of Zambia and Zimbabwe?
In the Wet Tropics World Heritage Area, the Barron Falls are the highlight of the Barron Gorge National Park. Not much more than a trickle for nine months of the year, the 125m (410ft) falls explode into life during the Big Wet (Dec-March).
8. The Grand Canyon National Park, Arizona?
The highlight of the Watarrka National Park, the sheer walls of Kings Canyon are more than 100m (325ft) high. Home to Luritja Aboriginal people for more than 20,000 years, the Canyon's 6km Rim Walk is one of Australia's most exciting strolls.
9. Isla Nublar aka Jurassic Park, Costa Rica?
You'll see plenty of native wildlife while wilderness trekking the 32km Thorsborne Trail on Hinchinbrook Island, but you won't see velociraptors or people: this uninhabited island on the Great Barrier Reef is Australia's largest island national park.
10. The Alpe d'Huez, France?
"The most amazing road in Australia, hands down" according to photographer Beardy McBeard, unsealed Jacob's Ladder climbs to the summit of Ben Lomond National Park in northern Tasmania, and everyone takes the same pic.
11. The Cliffs of Moher, Ireland?
SA's seriously epic Eyre Peninsula has more than 2,000km of coastline and some of the nation's most dramatic sea cliffs. Offshore are colonies of seals and sea lions, and Australia's biggest Great White Sharks.
12. The Old Man Of Stoer, Scotland?
Located within the Tasman National Park, the breathtaking 300m (1000ft) high cliffs of Cape Hauy are best viewed by boat: some brave, crazy people rock climb to the top!
13. Copper Canyon, Mexico?
Almost 30km long and up to 600m deep, Carnarvon Gorge is the highlight of the nearly 3000 sq km Carnarvon National Park, which contains forty diverse ecosystems hosting 23 species of rare fauna and more than 200 bird species. It's wild!
14. Acantilados de Los Gigantes, Canary Islands, Spain?
Often described as "The End of the World", the Bunda Cliffs run more than 100km along the Great Australian Bight, and are the longest uninterrupted line of sea cliffs on Earth. They fall dramatically into the Southern Ocean from the Nullabor Plain.
15. Big Sur, California?
The Sea Cliff Bridge in northern Illawarra was built after the old road was closed by rock falls. NSW's Pacific coastline is wild and rugged, particularly immediately north and south of Sydney.
16. Ngorongoro Crater, Tanzania?
Named after the eucalyptus mist they are shrouded with in summer, these iconic hills are often blanketed with mist. Part of the Great Dividing Range, the Blue Mountains stretches 95km (60 miles) and features gorges up to 760m (2,490ft) deep.
17. Bora Bora, French Polynesia?
600km off the New South Wales coast, volcanic remnant Lord Howe Island is a nature lovers paradise, with amazing scuba, snorkeling and bird watching, natural forest and amazing trails to explore. Towering over it all is 875m Mount Gower (2,870 ft).
18. Rio De Janeiro, Brazil?
Some of Australia's most stunning World Heritage-listed wilderness, the Arthur Ranges in south west Tasmania are as wild, desolate and beautiful as it gets. Also, do yourself a favour and follow Chris Wiewiora on Instagram. His shots are amaze.
19. Angel Falls, Venezuela?
Plunging 200m (660ft) in a single drop during the Top End wet season, the mighty Jim Jim Falls in the vast Kakadu National Park are best viewed from the air: during the tropical summer it is impossible to reach them any other way.