This one was obvious. I think that the Batcave is the coolest hideout in all of comic books. Built under his mansion, the Batcave is a series of subterranean caves. It was a way for slaves to travel when escaping during the civil war era. It’s home to American Brown Bats, which are feed by Alfred. Bruce uses the caves as a sanctum, that he also uses to fight war on crime. Batman is able to monitor Gotham and the world. It’s most important equipment is the supercomputer that is on par with national security agencies. It connects to major information networks, stores massive amounts of data, and can connect to satellites. The “Bat-computer” is considered to be one of the most supercomputer systems.
Batman keeps his collection of ancient armor worn by Knights, nomads and Samurai in the Batcave. It also has facilities such as “crime lab, various specialized laboratories, mechanized workshops, personal gymnasium, a vast library, parking, docking and hangar space for his various vehicles as well as separate exits for the various types, trophies of past cases, a large bat colony, and a Justice League teleporter.” The Batcave has a “subway rocket” that allows him to travel via the Gotham Rail System, allowing him to get to Gotham City quickly. The cave is often powered by a nuclear reactor or a hydro-electric generator. The Batcave is safeguarded against earthquakes and a nuclear catastrophe. It’s rumored that there’s a “Lazarus Pit” in the Batcave but that claim hasn’t been proven.
Finally, the Batcave is home of memorabilia from villains. It features a full-sized T-Rex, a large U.S. penny and a Joker playing card. Batman has kept “Two-Face’s original coin, Deathstroke’s sword, the shroud of the Mad Monk, a collection of the Penguin’s deadly umbrellas, a Joker laughing fish, one of Harley Quinn’s popguns, a Scarface dummy, Bane’s mask and Venom tank, Mad Hatter’s top hat, the Red Hood’s domed helmet and original costume, Maxie Zeus’s lightning weapon, and an over-sized collection of bowling ten-pins.”