El Portal de El Yunque is an exhibition and information center located in El Yunque, the only tropical rain forest in the United States and its territories. Visitors enter the structure by crossing an elevated pedestrian walkway, which places them near the very essence of the forest: the canopy formed by the trees. As the façade of the building disappears from view inside the main hall, the open and skeletal structure blends into the forest canopy. Water flows around the perimeter of the central square and cascades down a rocky bed into existing natural waterways on both sides. The center includes administrative offices, a theater and 12,000 sq. ft. of exhibition space.