architectual experiment and café at the Serpentine Gallery in Hyde Park.
It's something to aim for as the object of a long bike ride across town, all the easier now they've finished the dedicated "cycle superhighway" along the Embankment (all Dutch-style separated roadspace and dedicated traffic light phases).
other angles, the Pavilion is not so much of a dark cavern. Since it's made of open fibreglass boxes, presumably quite light and easy to bolt together quickly, it's light and airy inside: though the breeziness might lose its charm on other sorts of summer day.
In the past, the pavilion has been a throwback to the 70s in style, a cloister hidden by a dark corridor, and a cork-lined hobbit-hole, among others; the last one I went to see was a Meccano puzzle, which like this year's almost invited exploratory climbing.
And there were some things worth seeing on the ride there, too: