Akihabara Radio Kaikan

Akihabara Radio Kaikan, often shortened to simply Radio Kaikan, is a key location in Akihabara in both Steins;Gate and Steins;Gate 0.

Steins;Gate
Radio Kaikan acts as the starting point for he game when Rintaro and Mayuri attend Dr. Nakabachi's conference in the building an Rintaro fist meets Kurisu. It is also the location of Kurisu's eventual death in the Beta Attractor Field.

In the Alpha Attracotr field, a satellite crashes into the building, destroying the room Dr. Nakabachi was going to speak in. This event causes Nakabachi to cancel the entire press conference and the police soon close the building and surrounding are to the public. Later on, Suzuha takes Rintaro and Kurisu to the building and explains that the satellite is actually her time machine. Suzuha had attempt to land on top of the building, but a miscalculation leads her to crash the time machine into the side of the building and the next day, the the entire Future Gadget Lab gathers there to help repair the machine over the next several days. Suzuha eventually leaves, leaving an empty hole in the building for the rest of the story.

Back in the Alpha Attractor Field, Suzuha land successfully on the building and calls the future science lab to the roof.

Steins;Gate 0
The final confrontation between Stratfor, DURPA, and Russian intelligence takes place on the roof and the destruction of the time machine on top of the building is one of the convergence points that leads to WWIII.