These 13 towering skyscrapers do solar power in a big way, with thousands of solar panels or even massive solar cell membranes that act as the building's 'skin'.

Sydney's celebrated Paddington Reservoir Gardens is a unique amalgamation of modern architecture and crumbling ruins, crafted from a disused urban reservoir.

In the future, will cities be portable, roaming across the terrain or hovering in the sky? These 11 mobile urban concepts challenge the stationary status-quo.

If the world is overtaken by rising sea levels and we're forced to give up the land for cities on the sea, hopefully they'll be as stunning as these designs.

Forget space - the next frontier is our oceans. These 12 visions for underwater living bring hotels, homes and entire cities beneath the surface of the sea.

What do you do with a decommissioned Boeing 747? One architect is remaking one of the planes into a unique, massive eco-home in the remote hills of Malibu.

The Solar Decathlon highlights the best and most innovative in solar home design. These 5 entries were picked as the judges' favorites in the 2010 competition.

Think that fleabag motel you stayed in was trashy? It was nothing compared to this hotel, which was made entirely of garbage found on the beach.

The 2010 World Expo in Shanghai is filled with wonders, but the UK Pavilion, known as the Seed Cathedral, is arguably the most awe-inspiring of them all.

Water towers can't often be called beautiful or thought of as gathering places. This amazing water tower design, however, is both of those and more.

Forget the sterile white aesthetic of mass-produced RVs: these converted buses and trucks are true houses on wheels, complete with porches and wood stoves.

This gorgeous housing development in Singapore will be one of the most beautiful apartment complexes ever, with open courtyards and plenty of eco-features.

A huge "island" of plastic garbage is already floating in the Pacific. Why not turn it into the habitable, self-sustaining island city of the future?

We've all seen vertical farm concepts, but this one takes the idea where it's never been: the ocean. Could the ocean be the future site of vertical farming?

Public spaces are rarely as functional as in this concept. These spaces would function as recreational centers when dry...and when filled with storm water.