Man Caves of the Many Men of Justice

Ever since the Batcave first appeared, it inspired several like sanctuaries for various superheroes throughout the ages. Just as there was a Batcave for each Dynamic Duo and an Arrowcave for the pairs of Battling Bowmen, Batman, Green Arrow and their sidekicks were not alone.

Aquaman of Earth-One and Sandman of Earth-Two had fixed bases, for the former under the seas and for the latter under his townhome. Based in New Venice and New York (or just York) City, these were not only refuges from the stress of crimefighting but a place of solace over the loss of life for Arthur Curry's son and the horrible transformation that occured for Wesley Dodd's adopted son Sandy. Similarly, the Sandman of Earth-One had his dream dimensional place and the Aquaman of Earth-Two had his own Aquacave to call home.

Additionally, there was the mountain lair of J'onn J'onzz and the mountain base of Vandal Savage occupying similar positions in Earths One and Two.

As for the Batcaves, each had similar features and were not only used by the Dark Knight's but also for other members of the Batman Family.

While the Batcaves were underneath Wayne Manor on the outskirts of Gotham City, both Bruces had a Wayne Foundation building built with replicas of the Batcaves underneath... the Earth-One version in Gotham City and the Earth-Two version in Metropolis.

Then there was the Arrowcaves, secret chambers within Oliver Queen's Star City (or Park City on Earth-Two) suite... not so much as cave except for how it mimics Batman's own method of keeping his crime investigation equipment, armory and trophies from his adventures in one locale.