Going underground: London’s new Postal Museum and subterranean mail train

The museum reflects the vital role Mail Rail played in the distribution of the country’s post with an underground train ride and exhibitions

Whitney museum: all aboard Renzo Piano’s steel-clad icebreaker

Having outgrown New York’s Upper East Side, the Whitney Museum of American Art has gone downtown, designed by an architect who says he’s proud still to be a ‘bad boy’