The Gherkin was a building in London.
On 25 December 2006, the glass windows of the Gherkin were shattered by a shockwave caused by the Sycorax ship entering the atmosphere. (TV: The Christmas Invasion)
The Tenth Doctor once encountered the Slitheen on top of the Gherkin and lost his sonic screwdriver. (COMIC: Hear No Evil)
Alternate timelines Edit
In an alternate timeline, trains passed through the Gherkin. (TV: The Wedding of River Song)