George Clarke looks back at some of the most creative builds he's encountered on his travels around the world. From a stunning glass house overlooking Italy's Lake Lugano, to an ingenious studio apartment in Barcelona featuring high tech multi-functional furniture. There's also a unique German water tower and a Texan house made of beer cans.

George Clarke looks back at some amazing spaces, from a double decker bus with a retractable roof, to a futuristic house with a living room hidden under the bed. George also revisits a trip to Germany and a space where an entire room mechanically opened like a drawer.

In this Amazing Spaces festive special, George Clarke and Will Hardie embark on a snow-covered design odyssey across the mountain ranges of western Canada. From a remote buffalo herder's lodge to the ultimate snowboarder ski chalet, and even a monster snowmobile big enough to live inside, this epic journey showcases the most ingenious Canadian structures built to survive and enjoy the stunning snowy surroundings. George and Will also build their own igloo.

In this special episode of George Clarke's Amazing Spaces, George and Will Hardie meet the daughter of a survivor of a World War II Japanese prisoner of war camp who has uncovered a remarkable secret. Jan Fursier has discovered in one of her father Reg's wartime diaries an immaculately illustrated guide to building a 1930s caravan, painstakingly created by her dad while held in captivity. Jan wants George and Will's help to bring the caravan to life. As they delve deeper and learn more about Reg, they uncover an incredible story of survival and resilience under terrible circumstances, and of a secret undercover POW university where officers gave illicit lectures, covering everything from the sciences to the best restaurants in London. Once the caravan is completed, George and Will invite Jan for an emotional reunion in the same Welsh national park where her father took the family on holidays after the war.

George meets a Cornish couple turning the country's most expensive public loo into a luxury cliff-top holiday home. He also unveils his futuristic rotating home at Pinewood.

George meets a Dorset couple building a room with great views over Chesil Beach. There's also a doggie campervan, and a remote lodge made almost entirely of glass in New Zealand.

In Lincolnshire, a couple are adding a dance floor to a rare campervan, while a small Stirlingshire business converts a Sea King helicopter into luxury overnight accommodation.

George meets a teacher building a classroom in a salvaged jet and a Devon couple turning a cricket scorebox into a garden hang out. There's also a steel treehouse in New Zealand.

George meets farmers Ali and Rich, who hope to salvage one of the rarest and - for its time - one of the most expensive caravans in the world: a 1950s Warwick Knight, complete with spiral staircase and roof garden. In Devon, fireman Nick wants to build a garden studio apartment for his mother-in-law out of an old dog house. George's New Zealand visit continues with a trip to a fold-out beach hut. And Will and George discover that an electric wheelchair could provide the engineering breakthrough they need to rotate their futuristic home.

In Devon, George Clarke meets Tabitha, whose mobile juice bar, made out of a horsebox, was stolen; so now she's building a new one. George and Will's futuristic rotating home takes a giant leap forward. And George's journey around New Zealand's amazing spaces continues as travels to the island of Waiheke to see a modernist tent.

George meets Sam, a conservation worker from Somerset who suffers from spinal muscular atrophy and is 30 years old. George is determined to change Sam's life by designing a fully accessible mobile home, allowing him to move freely inside as well as taking it on the road to travel the country. In Derbyshire, George meets James, a former pub landlord, who's building his new girlfriend a surprise house warming gift - a pub in their back garden. In New Zealand, George's travels to the island of Waiheke to see a modernist tent. And George and Will look for engineering inspiration for their futuristic rotating home.

The show that celebrates ingenious, inventive and eccentric small builds is back. In the opening episode, George meets a pair of newlyweds who traded in a luxury honeymoon to spend the money on an old army truck they plan to transform into a mobile holiday home. There is also a master craftsman in Devon making an eco-friendly luxury treehouse complete with sauna, spiral staircase and even a slide. In New Zealand, George visits a hilltop beach house overlooking the Pacific with the most decadent bath he has ever seen. And George and Will Hardie want to build a gravity-defying, rotating home inspired by vintage sci-fi comics.

George looks back at some of the most ingenious Amazing Spaces builds, from a toilet converted into a luxury home to a tube carriage transformed into a stylish office.

George looks at some of his best builds by the sea, including a multifunctional beach hut in Bournemouth and a 21st-century update of a Victorian bathing machine in Margate.

George looks back across five series of Amazing Spaces and the incredible works of engineering people have achieved with their vehicles - from the scrap Learjet turned into a luxury garden studio to the restoration of the only surviving British mobile cinema truck. There is also the 1950s railway carriage converted into a three bedroom home and an incredibly stylish custom-designed Jeep transformed into a cocktail bar.

George Clarke looks back across five series of Amazing Spaces and some of the amazing houseboats people have built for the Great British waterways. There's a seaplane from World War Two transformed into a bachelor pad; a 1960s pleasure cruiser refurbished as a marital home; and a hand built custom designed writers retreat created in the shape of an egg. George also looks further afield to an amazing holiday apartment on a lake in Germany and a Danish waterside home kept afloat by polystyrene and water bottles.

As George Clarke completes his review of five years of Amazing Spaces, he reflects on the incredible things it's possible to build in the humble back garden: from a cliff-top stargazing retreat to a glorious garden room made from a derelict swimming pool, and the country's most multi-functional shed. George also looks back on his own garden build, where he and Will Hardie transformed his knackered old garage and unloved lawn into the ultimate garden family studio.

This time he focuses on how nature and architecture can work harmoniously together in the glorious world of cabins in the wild. There's a mountain-top ski lodge in Italy only accessible by helicopter; a hobbit-inspired cob house in Oxfordshire built for only ú150; and a concrete dome-home built under a man-made hill in a Texan hurricane valley. And George reflects on his own wilderness cabin that he built in the Sussex woodlands.

George looks back at some innovative and eccentric builds, from a tiny Italian tuk tuk campervan to an Airstream party pad and a trailer caravan clad in old CDs.

George looks back over some favourite treehouses from Scotland to Sweden and Tuscany to Northumberland.