One of the design elements that makes this land unique is the Endless Caverns area that runs alongside the majority of the perimeter. This subterranean network of caves is essentially an "arcade" style walkway like the ones found at Disneyland Paris, just hyper-themed and immersive.
The caves stretch along the backside of the land and are carved into the actual rockwork that makes up the "berm" of sorts. As guests walk through them, the surroundings gradually shift into four distinct settings. Each setting comes complete with its own side entrance/exit back into the main walkways of the land. The four chambers are the Rainbow Caverns, the Crystal Grotto, the Elemental Core, and the Buried Kingdom. More narrow cavernous hallways connect the chambers which expand out into larger areas of the caves, giving this area a very explorable quality.
The Rainbow Caverns are exactly what they sound like. It's a borderline brick-by-brick recreation of one of Disneyland's most iconic "Yesterland" set pieces except now fully explorable and free for guests to linger in for as long as they like. The only slight change is the lighting is modernized and with the help of Disney's overused but still effective projection mapping the rainbows of the water pools come alive with a vivid color one could only dream of back in the original incarnation of the Nature's Wonderland scene.
The Crystal Grotto features a towering array of multicolored crystal formations and is a true sight to behold. The crystals glow and glisten with enhanced lighting effects. One of the standout features of this chamber is the see-through quality of some of the larger crystal structures, some of which even come with funhouse mirror style distorting reflective elements. It's sure to make the Crystal Grotto a go-to favorite for the Instagram crowd.
The Elemental Core is essentially a "Center of the Earth" for the endless caverns. In this chamber the flowing rivers of lava collide with towering icebergs, making for a striking visual contrast. The stand-out element of this chamber is actually the temperature of the room itself. Through state-of-the-art AC/heating, guests will feel themselves seemingly go from sub-zero temperatures to a burning hot hellscape depending on where they're standing in relation to the centerpiece iceberg.
Finally, the Buried Kingdom depicts a small castle and surrounding settlement that has long since been abandoned following a massive avalanche having taken place hundreds of years ago. Buildings and tower torrents lay toppled and overgrown, a haunting reminder of the civilization that once called this place home. It's the most somber and least visually ambitious of the four chambers, but also the one that contains the most explorable nooks and crannies and acts as a very small equivalent to the main Forgotten Castle walkthrough attraction.