But here's a real one that comes close: Nightmare Range, a target-practice area in far north South Korea. It's just a hop-skip-and-a-ricochet from the DMZ, certainly reachable by shell from the DPRK's dug-in heavy artillery just north of the border.
Here's a map, from a recent naval survey of training sites, with the label for Nightmare Range highlighted at upper left, with its location to the side:
Here's an aerial photo of Nightmare, from the Wikimapia site:
This obscure location came up briefly during an August 18, 1976, meeting of the Washington Special Action Group (WASAG), a small but very influential foreign-policy advisory group in the Ford Administration and, previously, the Nixon White House.
The subject that day was what to do about a murderous attack in which a squad of North Korean soldiers jumped a small American-ROK team that was attempting to trim a poplar tree for better sightlines between observation posts in the DMZ.
Among the many response concepts bounced around by WASAG (not all of which have been declassified) was having American aircraft do practice bombing runs all the way up to Nightmare Range. That was scrubbed as too provocative, and more modest measures were taken when finishing the tree-trimming two days later ... but with a great deal of firepower waiting just over the nearest hill. Call it armed arboreal diplomacy.
For those interested in knowing more about what North Korea itself called an "ultra-tense" situation, I'm researching it as part of an article on military alerts to be published in Air&Space.