While most Chinese cities have seen their communal housing buildings disappear one by one over the past half century, Shanghai's Pig Cage Stronghold is still standing, and the vibrant home to hundreds of people. Read more and see the pictures...

A cluster of towns in Algeria endured over a week of catastrophic and fatal flash floods after the banks of the Oued M'Zab burst, leaving nearby buildings buried under thick sludge. Our Observer in the area filmed the extent of the damage on his mobile phone. Read more...

Built in the early eighties, these extraordinary sea-view homes are known as the "UFO houses" by the Taiwanese. Just 15 kilometres from the capital, the deserted residences have been left abandoned for the past three decades. Now they face imminent demolition. Read more and see photos...

Climatologists around the world agree that sea levels will continue to rise throughout the 21^st century. Countries with low-lying coastal areas like Vietnam and Bangladesh could see more floods and the loss of land, and some Pacific Islands could one day end up completely submerged. But not to worry - a Belgian architect has come up with a solution. He's designed "amphibian towns" to house the future refugees. Read more...

Just ten years ago there were barely a dozen skyscrapers in site in Moscow. Today soaring towers dominate the skyline and the city boasts Europe's tallest building. Our Observers in Moscow wonder how the rapid changes will affect the capital. Read more...