Published April 4, 2024

Important X-Men Locations, Explained

Discover the Xavier Institute, Genosha, the Morlock Tunnels, and other locations that have played a critical role in X-Men history.

To survive in a world that hates and fears them, the X-Men and their mutant allies need places they can call their own. Due to the unique status of mutants within the wider Marvel Universe, the X-Men, their allies, and even their enemies have frequently stepped away from the rest of Marvel's heroes and villains. Instead of finding safety in isolation, though, mutantkind faced new threats as their fight to save their future spread to new battlegrounds. 

Now, let's take a closer look at some key locations across X-Men history, from the team's bases to mutant hideouts and villain strongholds. We'll also break down why these places are so important to X-Men lore and how they factored into some of the most critical moments in Marvel history.


The official name of Xavier's School for Gifted Youngsters has changed numerous times, but its mission has remained the same since its debut in X-MEN (1963) #1 by Stan Lee and Jack Kirby. The Xavier Institute has given generations of X-Men and other mutants a place to study, train, and learn how to survive and protect a world that does not accept mutants. 

Before it was a school, the X-Mansion was the family home of Charles Xavier; both he and his stepbrother, Juggernaut (Cain Marko), grew up on the sprawling estate. The Institute has been heavily damaged or destroyed numerous times, but the Graymalkin Lane mansion has always been rebuilt in Westchester County, New York. In addition to serving as the X-Men's base, the Xavier Institute has occasionally welcomed human students, further embodying Xavier's dream of a future where mutants and humans cohabitate peacefully.


Debuting in UNCANNY X-MEN (1963) #169 by Chris Claremont and Paul Smith, a group of outcast mutants called the Morlocks hid themselves away from the rest of the world. Feeling rejected by society, the Morlocks turned the unconnected sewer lines and abandoned subway stations of New York City into a vast underground habitat called the Alley, or more commonly, the Morlock Tunnels

Under the leadership of Callisto, the Morlocks endured numerous trials, including the "Mutant Massacre." After realizing his research had been used to experiment on some Morlocks, a furious Mister Sinister had Sabretooth and his Marauders butcher hundreds of the underground mutants during this crossover event.

The Morlocks left the tunnels when Professor X and Magneto invited the world's mutants to the mutant nation Krakoa. When the mutant-hating group Orchis launched a global attack on Krakoa, the X-Men used the Morlock Tunnels as a temporary base.


To carry out his numerous plans against the X-Men and conduct his cruel experiments on mutants, Mister Sinister has maintained a series of interconnected labs and bases since his debut in UNCANNY X-MEN (1963) #221 by Chris Claremont and Marc Silvestri. For instance, Sinister once operated out of a base underneath the Nebraska State Home for Foundlings, the orphanage where Cyclops grew up, which allowed him to manipulate and torment the young X-Man from afar. At the Weapon X facility in Canada, Sinister oversaw the Neverland camp, where thousands of mutants were killed. 

Frequently staffing his labs with clones of himself, Sinister has kept facilities in isolated locations in Alaska and Antarctica, as well as near major cities like San Francisco. In addition to his lab on Muir Island, Sinister operated out of Bar Sinister, an island in the Pacific Ocean, where he began his efforts to create a complete genetic database of every mutant on Earth.


Although Genosha is a relatively small island nation, it has been the site of two of the most horrific events in the history of mutantkind since debuting in UNCANNY X-MEN (1963) #235 by Chris Claremont and Rick Leonardi. Initially, Genosha was led by a harsh anti-mutant regime that used mutants as forced labor. Under the leadership of mutant haters like Cameron Hodge and the Genegineer, Genoshan mutants were brainwashed into mindless "mutates." 

After the X-Men toppled that regime, Magneto eventually emerged as the island's new ruler. Although Magneto's Genosha was more welcoming to mutants, most of the nation's population was wiped out in a Sentinel attack planned by Cassandra Nova, Xavier's evil twin sister, in NEW X-MEN (2001) #115 by Grant Morrison and Frank Quitely. While villains like Selene and the Red Skull briefly established based in Genosha, the nation has remained largely unoccupied, despite a few attempts to rebuild and resurrect its residents.


Located in a dimension called the Mojoverse, Mojoworld is a media-obsessed world ruled by the tyrannical Mojo. The Spineless Ones and the other residents of Mojoworld grew dangerously obsessed with entertainment after receiving TV broadcasts from Earth. Using a race of genetically engineered humanoid servants, Mojo has satisfied his population with a constant flow of new programming since Mojoworld's debut in LONGSHOT (1985) #1 by Ann Nocenti and Arthur Adams

Mojo is obsessed with turning mutants into content, and he created young clones of the X-Men called the X-Babies, who are some of Mojoworld's biggest stars. Mojoworld is also the homeworld of Longshot, a genetically engineered stuntman who rebelled against Mojo and joined the X-Men, and Shatterstar, Longshot's son with the X-Men's Dazzler. Although she served as Mojo's enforcer for years, Spiral—a six-armed cybernetic sorcerer—broke free of his control and became one of the X-Men's closest allies on Mojoworld.

Want to read more about the X-Men adventures at these locations? Join Marvel Unlimited for instant access to 30,000+ comics on the Marvel Unlimited app or on the web, with digital issues spanning Marvel Comics classics to ongoing series!


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