The Hellfire Club Building is located at 840 Fifth Avenue, between 66th and 67th Street on Manhattan's Upper East Side in the Lenox Hill neighborhood of New York City, only a few blocks north of the Avengers Mansion.
The Hellfire Club also maintained a large headquarters in London, England. Both mansions were known for their underground sub-levels that were very large and included an underground train system.
Credit: marvel.fandom.com
Key Issues & Appearances
1
Significant comic book appearances featuring Hellfire Club Mansion
