For the Geo Quiz, we are looking for a London landmark that was originally commissioned by an Anglo American trade association. It opened in July 1925, and was later declared "the most expensive building in the world."
But that's not how most people know the place today. For more than 70 years, this building has been home to the BBC World Service.
The World Service is leaving its historic home this week for newer digs elsewhere in London.
Bush House is the answer to the Geo Quiz.
Anchor Marco Werman talks to Julian Marshall, a presenter for the BBC's Newshour program.
Marshall has also presented numerous other programs at Bush House over the years.