Peach's Castle (Super Smash Bros.)
From the Super Mario Wiki
Peach's Castle is a stage in Super Smash Bros., and is heavily based off of Princess Peach's actual castle. The castle is actually a very small arena suspended in the air. In actuality, the stage may just be a piece of land that is part of Princess Peach's Castle, as the actual castle can be viewed far below the arena. This arena has a moving board that wends into the castle and comes out on the other side, making temporary platforms on both sides. It also has two Bumper-like platforms at the top, which will stop players from being knocked out of the stage. There is also a Bumper in the middle, which moves back and forth. A Lakitu also makes a cameo appearance in the background after a few minutes. The "Challenger Approaching!" match to unlock Luigi in Super Smash Bros. takes place here.
This stage was also released as a downloadable stage for Super Smash Bros. for Nintendo 3DS / Wii U on July 30, 2015, under the name Peach's Castle (64). While the stage has been recreated near-exactly, the ledges on the moving platform can now be grabbed. The new Omega form of this stage is set on a larger form of the base platform, though the platform now lacks the railing in the foreground and background; a red carpet has also been placed on both sides of the tower
Although the original Peach's Castle stage did not appear in Super Smash Bros. Melee, a similarly-named stage which was situated upon the actual castle appeared, and was referred to as Princess Peach's Castle and the music was reused for the Luigi cutscene in Adventure Mode.
Super Smash Bros. for Nintendo 3DS
Super Smash Bros. for Wii U