A futur­is­tic rug­by and soc­cer sta­di­um, opened in 2011 for the Rug­by World Cup, it is ful­ly enclosed with a grass sur­face A the only such sta­di­um in the world. (The roof is trans­par­ent, allow­ing grass to grow.) Some are already start­ing to call the sta­di­um the Green­house of Pain a play on House of Pain, the nick­name of Caris­brook, the sta­di­um it replaced.