Temple of Gloom
From the Super Mario Wiki
The Temple of Gloom is a temple located in the depths of Dark Land in the TV series, The Adventures of Super Mario Bros. 3. It only appears in the episode, "Do the Koopa". After Luigi finds the map of the temple and shows it to Princess Toadstool, Princess Toadstool then explains to her friends that the Doom Dancer Music Box she wants is located in the Temple of Gloom. Before they set out, Luigi is nervous about entering the same land King Koopa lives in and he states that he hates dancing. Mario convinces him otherwise and they set off to go to the Temple of Gloom.
Mario and friends, after dodging a lot of obstacles in Dark Land, arrive to the Temple Gloom, which is guarded by Dry Bones. After stomping on the Dry Bones, the friends bash blocks to create a barrier from the Dry Bones and then enter the Temple of Gloom.
The Temple of Gloom also has a lot of obstacles such as King Koopa statues firing laser beams, but the friends safely make it to the door of the room that holds the Doom Dancer. Cheatsy Koopa, Bully Koopa, and Big Mouth Koopa sneak and eavesdrop the friends and they plot to snatch the Doom Dancer by making a trip string.
After Mario grabs the Doom Dance, booby traps go off in the Temple of Gloom, but Mario and his friends escape safely out of the temple, only to have their Doom Dancer snatched away by the Koopalings, and Bully Koopa leads everyone affected by the Doom Dancer music into King Koopa's Castle.