POV Vesuvius:
The light flickered in the cave-like tunnels as the huge dragon flew through, lightning crackling around him, the long trail of dark smoke stretching behind him.
His eyes were fully focused on a massive structure blocking his path.
A giant stone tower, built of massive black bricks, each large enough to fit an entire house, connected the cave's floor with its ceiling, thick enough to encompass a small town into its interior. The lake of phosphorescent liquid calmly glowed around it, the tower looming over it. However, there was no reflection in the crystal-clear liquid.
A lonely and narrow bridge poised above the lake connected the tower with the shore. The bridge was made of a single piece of smooth, black stone, suspended in the air and not touching the lake as if it floated.