Here are some photographs of a renovated fortress in northern Italy that now features patinated steel bridges, an extended underground tunnel and concrete towers. More about Fortress of Franzensfeste by Markus Scherer and Walter Dietl
What appears to be an open tunnel beneath a bridge in northern Spain is in fact a concealed passageway, screened behind a secret mirror. More about Mirror lab by VAV Architects
This jumbled house in India features an elevated steel tunnel, bridged corridors and a rooftop swimming pool on stilts. More about House at Alibag by Malik Architecture
Brazilian architects Metro have completed a red glass chocolate museum in the sky. More about Nestlé Chocolate Museum by Metro
Estonian studio Salto Architects have completed a temporary summer theatre in Tallinn made of black spray-painted straw bales. More about NO99 Straw Theatre by Salto Architects
London set designer Gary Card has completed the interior of this east London boutique, including a bright orange tunnel. More about LN-CC by Gary Card
This bar in Shanghai by 3Gatti Architecture Studio has an undulating cave-like form created by apertures cut into fins along its length. More about Zebar by 3Gatti Architecture Studio
This underground railway station with criss-crossing concrete beams is by Hungarian firm Spora Architects and currently under construction in Budapest. More about Fővám tér by Spora Architects
Five agricultural growing tunnels stand inside a former book store in Kanazawa, Japan, for this exhibition designed by Japanese studio Nendo. More about International Triennale of Kogei by Nendo
Construction has begun on a subway station in Naples, Italy, designed by London studio Amanda Levete Architects and artist Anish Kapoor. More about Monte St Angelo Subway Station by Amanda Levete Architects and Anish Kapoor
Tokyo 09: architect Makoto Tanijiri of Hiroshima architects Suppose Design Office designed an exhibition environment based on clouds for Designtide Tokyo in Japan last week. More about Cloud by Makoto Tanijiri
Cloud Tower is a pavilion for open-air concerts in the grounds of a castle near Vienna, Austria, designed by the next ENTERprise - architects. Photographs are by Lukas Schaller. More about Cloud Tower by the next ENTERprise – architects
Photographer David Cowlard has sent us these construction photos of the world's most powerful particle accelerator, the Large Hadron Collider, which was switched on by the European Organisation for Nuclear Research this week. More about Large Hadron Collider photographs by David Cowlard
Technicolor Bloom is an architectural installation constructed from 1400 flat plywood panels to form a double-curved perforated tunnel. More about Technicolor Bloom by Brennan Buck
Seasons Through the Looking Glass is an installation by CJ Lim/Studio 8 Architects at the subway entrance to the Victoria & Albert Museum in London. More about Seasons Through the Looking Glass by CJ Lim/Studio 8 Architects
Stockholm Design Week: Xile, a flexible tunnel designed by Swedish designer Mats Karlsson, is one of three winners of the Forum AID Award 2008, announced in Stockholm on Tuesday. More about Xile by Mats Karlsson
London designers PearsonLloyd recently completed the interior of a new UK headquarters for office furniture manufacturer Steelcase. More about Steelcase WorkLife by PearsonLloyd
