Everyone needs some form of shelter, but not everyone is happy with urban or even suburban lifestyles.
Some prefer to live as far away from other people as possible.
In the most extreme cases, that means going where no dwellers have gone before.
The island known as 'Just Room Enough Island' is one of the famous Thousand Islands that straddle the US-Canada border in the Saint Lawrence River. There are a few lawn chairs out front on the family's tiny beach.
Humans have been seeking out remote locations for a long time. Approximately 300 years ago, Iceland's Elliðaey Island was home to five families who hosted passing puffin hunters. As if the hulk of floating rock wasn't isolated enough, the families also built a fence around their property.
Meanwhile, some people actually build homes inside the earth. Coober Pedy is an opal mining town in Australia where 80% of people have moved underground to escape the scorching 120-degree heat. People have lived there for over 100 years.
When he was 26, software developer Joel Allen built his own version of a treehouse in Whistler, Canada. Its design is a little more polished and modern.
The Paro Taktsang Monastery is tucked away on a rock face in Bhutan's Paro Valley. The complex has been around since the 17th century. Monks who practice the local form of Buddhism can spend years in the temple and never go down into the valley.
Even further removed is the complex of monasteries known as Meteora, in Greece. Sitting atop sandstone pillars, the places of worship have been recognised as a UNESCO World Heritage Site.
Perhaps the highest-altitude house is the Solvay Hut, located more than 4000 metres up the face of the Matterhorn in Zermatt, Switzerland. It contains 10 beds to give weary hikers a rest.
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