Architecture office Adept and landscape studio Mandaworks have been selected to masterplan three key sites within one of northern Europe's largest urban development areas – the Stockholm Royal Seaport. More about Adept and Mandaworks to transform 18 hectares for Stockholm's Royal Seaport
A colossal iron staircase bursts through the medieval stone walls of this fortified tower in rural Italy and into a copper-clad extension, as part of a renovation by local studio Gianluca Gelmini (+ slideshow). More about Gianluca Gelmini inserts an angular iron staircase inside a medieval Italian fortress
Tasked with designing a house that doesn't take over its whole site, Swiss architect Christian von Düring created a timber-clad upper storey that straddles two smaller ground-level structures (+ slideshow). More about Christian von Düring completes a house designed to function like a bridge
Photo essay: Canadian photographer Christopher Forsyth has spent the last seven months shooting the subterranean stations that make up Montreal's four-line metro system (+ slideshow). More about Christopher Forsyth embarks on a project to document all of Montreal's metro stations
A concrete staircase with a granite surface is suspended inside the atrium of this house in Porto Alegre, Brazil, which is divided into two parts connected by a bridge (+ slideshow). More about Casa 2V by BR3 Arquitetos features a bridge, a courtyard and a granite-topped staircase
The four buildings that make up this affordable housing development in Santa Monica, California, all feature mint-green solar shades on their facades, and are organised around a "starfish-shaped" courtyard (+ slideshow). More about Kevin Daly Architects builds a low-cost housing community in Santa Monica
This house in Spain by architect Ramón Esteve is fronted by solid stone walls, behind which rooms are organised around a swimming pool and terrace (+ movie). More about Casa El Bosque is a house flanked by stone walls on the edge of a Spanish forest
American architecture firm SOM has completed work on a controversial 50-storey hotel and condominium tower on a site directly opposite New York's Museum of Modern Art. More about SOM's Baccarat tower in New York overlooks MoMA's sculpture garden
After almost five years in the making, architecture studio FAT and artist Grayson Perry have completed their fairytale-inspired Essex holiday home, which was designed as a shrine to the fictional character Julie Cope (+ slideshow). More about Grayson Perry and FAT reveal the elaborate interiors of their House for Essex
This house in Tokyo was constructed using an industrially manufactured steel framework and cladding, making it look more like a factory than a residence (+ slideshow). More about Niji Architects uses steel components to build factory-like Boundary House
British architect Guy Hollaway has unveiled plans for the "world's first" purpose-built multi-storey skatepark, which he says will help prevent young people from moving away from a sleepy British seaside town (+ slideshow). More about Guy Hollaway plans to "put Folkestone on the map" with world's first multi-storey skatepark
London studio Haworth Tompkins has completed its £80 million refurbishment of Brutalist icon the National Theatre, including the addition of an all-new aluminium-clad theatre production facility (+ slideshow). More about Haworth Tompkins completes renovation of Denys Lasdun's National Theatre
Claesson Koivisto Rune has designed an art gallery in Marfa, Texas, which is the Stockholm studio's first completed project in the USA. More about Claesson Koivisto Rune pays tribute to Donald Judd with first US building
New York architecture studio Diller Scofidio + Renfro has unveiled a preliminary design for a new museum in Colorado Springs dedicated to the legacy of US Olympic and Paralympic athletes (+ slideshow). More about Diller Scofidio + Renfro unveils spiralling design for US Olympic Museum
Zaha Hadid Architects has unveiled plans to build a high-density housing development in Monterrey, Mexico, despite having been asked to design a series of high-rise towers (+ movie). More about Zaha Hadid plans sinuous apartment complex for first project in Mexico
A ride in Norman Foster's helicopter, a chance to test Bjarke Ingel's smoke-ring-blowing power plant chimney in Copenhagen, a hot-tub hangout with Charles Renfro, and a birdwatching adventure with Jeanne Gang are among prizes being auctioned off by an American nonprofit organisation. More about Starchitect experiences offered as auction prizes
A sliver of glazing stretches all the way up from the ground to the roof of this extension to a west London house, which is named The Lantern in reference to the way it glows at night (+ slideshow). More about Fraher Architects completes an extension with a window that stretches up to the roof
A drystone wall frames the glazed pavilions that make up this family summer house, which is perched on a hilltop on the southern tip of Melbourne's Mornington Peninsula (+ slideshow). More about Rugged drystone wall frames Whitehall Road Residence by B.E. Architecture
A glazed corridor connects the four house-shaped buildings that make up this holiday home on the outskirts of Porto, designed by young Portuguese studio PROD (+ slideshow). More about PROD's House of Four Houses comprises a family of interlinked buildings
Solar panels cover the rooftops of these four townhouses in Boston by local firm ISA, allowing them to sustainably produce more energy and hot water than their occupants are likely to use (+ slideshow). More about Roxbury E+ townhouses in Boston designed to produce more energy than they use