American firm Johnston Marklee has designed a circular house with a paddling pool on the roof as part of a series of inventive holiday homes proposed by architects including Sou Fujimoto and Didier Faustino for a national park in Spain (+ slideshow). More about Johnston Marklee designs rotunda residence for series of Spanish holiday homes
T is for Japanese architect Toyo Ito, whose Tama Art University Library is behind today's advent calendar window. Completed in 2007, the library comprises slender concrete arches that span lengths of up to 16 metres. Ito was also this year's Pritzker Prize laureate and his other projects include the Za Koenji Public Theatre in Tokyo.
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Hungarian art and design collective Szövetség'39 has unveiled a concept to reduce the impact of rising sea levels in the world's delta regions by introducing a modular structure that will cultivate mangrove forests to form natural dams. More about Modular CALTROPe structure reduces impact of rising sea levels by cultivating mangrove forests
A concrete kitchen worktop doubles up as a dining room floor inside this renovated house in Porto by Portuguese studio Ezzo (+ movie). More about House in Porto features concrete floors that double as kitchen worktops
A house modelled on the form of an explosion by Portuguese artist and architect Didier Faustino looks set to become the next completed residence in the series of Spanish dream houses for French developer Christian Bourdais. More about Didier Faustino's Big Bang-inspired structure to be next in series of dream houses
Sou Fujimoto is the nineteenth architect to feature on our festive calendar. The Japanese architect, who claims to design structures "in between" architecture and nature, designed a cloud-like structure for this year's Serpentine Gallery Pavilion and previously completed a tiny wooden house built from a stack of chunky timber beams (pictured).
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Japanese architect Sou Fujimoto has designed a house encased in a lattice of giant sticks as part of a series of dream houses proposed for Spain's Matarraña region (+ slideshow). More about Sou Fujimoto's Geometric Forest to feature in series of Spanish dream houses
A rock garden filled with trees and shrubs is sandwiched between glazed rooms and floating windowless walls at this house in Japan by mA-style Architects (+ slideshow). More about Green Edge House by mA-style Architects has a hidden garden around its perimeter
This symmetrical concrete house by Chilean studio Pezo Von Ellrichshausen is the first in a series of 12 holiday homes underway in the Spanish canton of Matarraña and will be followed by others designed by Sou Fujimoto, Didier Faustino and more (+ slideshow). More about Pezo von Ellrichshausen's Casa Pezo is first of 12 architect-designed dream houses
Famous for their collaboration on the iconic Pompidou Centre in Paris in 1977 (pictured), Richard Rogers and Renzo Piano both feature as the letter R in our A-Zdvent calendar of architects. Italian architect Piano recently completed an extension to Louis Khan's Kimbell Art Museum in Texas, while Rogers' London firm has just won a competition to design a new centre for social sciences at the London School of Economics.
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A high-end hair salon and family home are separated by a courtyard planted with a single tree in this building designed by Tokyo firm Apollo Architects & Associates in the Japanese city of Hamamatsu (+ slideshow). More about House with a hair salon hidden at the back by Apollo Architects & Associates
News: here are the first photographs of Denton Corker Marshall's visitor centre at Stonehenge - a prehistoric stone circle in England - which finally opens to the public tomorrow (+ slideshow). More about Stonehenge Visitor Centre by Denton Corker Marshall opens tomorrow
This cluster of wooden cabins in Norway by architecture studio Rever & Drage features a hut with a retractable roof and a pair of sheds that slide open to frame views of a nearby fjord (+ slideshow). More about Wooden sheds by Rever & Drage with sliding doors and a retractable roof
There aren't many architects whose names begin with Q, so our seventeenth A-Zdvent calendar entry is Belgian artist Arne Quinze, who built this 20 metre-high installation in Germany in 2009. Other architectural structures by Quinze include The Sequence, a canopy of tree-like forms installed outside the Flemish Parliament in Brussels, Belgium.
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Portuguese architect José Carlos Cruz claims to have built the world's first cork-clad hotel, located amongst the olive and cork trees of Portugal's Alentejo region (+ slideshow). More about José Carlos Cruz completes "world's first cork-clad hotel"
News: London architecture office FAT has announced that it will shut down its studio next summer, after "exploring the potential of the projects as much as possible". More about FAT architects announce studio closure
Japanese architect Kazuhiko Kishimoto designed the ground floor of this house in Yokohama with barely any walls so it can function as a gallery and seating area for members of the local community (+ slideshow). More about House by Kazuhiko Kishimoto has a public seating deck and gallery underneath
Design Miami 2013: architects OMA and Foster + Partners will work alongside Hollywood power-couple Baz Luhrmann and Catherine Martin to create a new ocean-side cultural quarter at Miami Beach in Florida, it was unveiled during Design Miami earlier this month (+ slideshow). More about OMA and Foster to work alongside Hollywood duo on Miami Beach
Dutch architecture studio Inbo has completed a transparent house in the Netherlands and has hidden it behind a grove of trees to protect the privacy of its residents (+ slideshow). More about Dutch studio Inbo hides a transparent house behind a grove of trees
P is for Peter Zumthor in today's A-Zdvent calendar window. The Swiss architect designed a Serpentine Gallery Pavilion in London in 2011, and was also responsible for the Brother Klaus Field Chapel in Germany (pictured) and a memorial to commemorate suspected witches in Norway.
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