Island of Ween

Island of Ween is a peculiar place, suffering from extended effects one of the more queer Paramecia-type Devil Fruit: Toki Toki no Mi. Due to an extremely powerful user, the island is trapped in permament nighttime since distant past, and as such it supposedly became a hiding place for various legendary creatures of the night. Due to that it has a reputation of an extremely dangerous, creepy place - yet for some reason, the Marine HQ designated it as a place for one of its bases before being destroyed by the Expedition crew.