Nibelheim Mansion is a significant location in the Final Fantasy VII video game. It is an abandoned and eerie building situated in the town of Nibelheim, known for its dark history and connection to the Shinra Electric Power Company. The mansion serves as a key setting for various plot developments and character backstories. Inside the mansion, players can explore numerous rooms filled with clues and items related to the game's lore. Notably, it contains the Basement, where players encounter the Jenova specimen and learn more about the mysterious Sephiroth. The atmosphere of the mansion contributes to the overall sense of intrigue and suspense in the game.