At the entrance to the path is a sign. It contains a written message from the Builders to the citizens of Ember, welcoming them. It warns them to be prepared for a rough climb that will take a few hours.
And boy does it. The trio climbs for hours before they reach the top, especially since Poppy needs to be carried quite a bit.
At some point, their candles go out, and they realize that they're not in total darkness. Hmm. That's new.
They reach a passageway.
Lina was expecting to see the city from her dreams, but instead she sees a wide, open space, unlike anything she's ever seen before. The sky is black, but studded with little lights, and there's one giant circular light in the sky too.
The beauty of this place totally blows them away. It's amazing, and nothing could've prepared them for it.
As they gape, the sky slowly starts to get brighter. It even turns blue. Then the sky fills with insects, which they recognize, and other, larger, flying things, which they don't.
They decide to share a meal, and read from the book while they do.