From the Super Mario Wiki
Pi'illo Castle is a large castle that appears in Mario & Luigi: Dream Team. It is the home of the rulers of Pi'illo Island, and prior to the Pi'illo species getting temporarily wiped out, where Prince Dreambert and various other Pi'illos of royalty lived. This is where Mario and Luigi begin their adventure.
Pi'illo Castle is a large stone structure with long vines and vegetation growing on its exterior. It has the symbol of the Pi'illos near the entrance. Above the entrance is a Zeekeeper face. The interior has stone walls and floors. One of the rooms contains a bed that Luigi sleeps on. This is also where Princess Peach is kidnapped by Antasma. It is also the location of the Battle Ring.
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