Why won't the Eden Project monument unlock?

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I'm trying to construct the Eden Project. I created the Cathedral of Plentitude (it's in the picture), and it's operational and has visitors. Why is the Eden Project still locked? How can I unlock it?
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How do you unlock the Eden Project?
To unlock the Eden project, you must have in your city the following unique buildings;How do you unlock the monuments in cities skylines?
Monuments are unlocked at the last milestone. To build a monument, you must have all the required unique buildings for that monument built, and all nine map areas have to be unlocked. When the requirements are met, the monument becomes unlocked and can be purchased.How does the Eden Project Work cities skylines?
The Eden Project is a huge glass house, perfect for vast gardens full of exotic fruits and plants. It greatly increases the city profile and removes pollution from land, air, and water, making land in the city area more valuable.What do unique buildings do in cities skylines?
Unique Buildings improve cities. Each unique building can only be built once. Unique buildings are divided into six levels which are unlocked at different milestones, but most require additional conditions to be met (see Unlocking Requirements in the table below), often for a sustained period of time.LICD: Why Won't She Leave
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Vlada Karpovich, Andrea Piacquadio, Michael Burrows, Karolina Grabowska