In the wake of last year's statistics-crammed Venice Architecture Biennale on the contemporary city, the third Rotterdam Architecture Biennale, from 24 May-2 September, returns to the theme and asks: 'What is the future of our cities and what role can architects play?' Curated by the Berlage Institute, it includes two exhibitions in Rem Koolhaas' Kunsthal: Visionary Power, which features projects by 15 international young practices, and New Dutch City ( www. biennalerotterdam. nl). Rotterdam is City of Architecture 2007, so there's plenty going on alongside the biennale, with workshops, tours, lighting schemes and additional exhibitions - among them, Le Corbusier: The Art of Architecture at the Netherlands Architecture Institute, a show set to come to Liverpool next year ( www. rotterdam2007. nl).
Hot on the biennale's heels comes the first Lisbon Architecture Triennale, from 31 May to 31 July, whose base will be lvaro Siza's Portuguese pavilion for Lisbon's Expo 1998 (see picture). The overall theme is the modish one of 'urban voids', with a conference starting on 31 May at which Zaha Hadid, Peter Eisenman, Eduardo Souto de Moura and Jan Kaplicky are among the speakers. Some might prefer an urban void to what Kaplicky is proposing in Prague at present ( www. trienaldelisboa. com).
With suitcase still packed, the next destination might be Denmark's exemplary Louisiana Museum at Humlebæk, where The Boundaries of Architecture: Cecil Balmond is this summer's attraction, opening on 15 June ( www. louisiana. dk).
Or perhaps Berlin, where, at the Akademie der Kunst from 16 May-8 July, there's an in-depth look at Interbau 1957 and the Hansaviertel - the lushly landscaped housing exhibition, with its roll-call of celebrity participants (Aalto, Jacobsen, Gropius), billed at the time as 'the city of tomorrow' ( www. adk. de).
This year's European Capital of Culture is Luxembourg, with two shows in spectacular industrial settings: All We Need at the former blast furnace building at Belval, and Retour de Babel at the steelworks in Dudelange. From 21 June another show, Sophie Calle and Frank Gehry: Exquisite Pain, will probably live up to its title ( www. luxembourg2007. org).