Fireworks Pile

Overview
The  is the focus of a series of limited-time missions released July 3, 2014.

The total cost to build and upgrade the pile is and July 27, 2024.

Fully upgraded it gives per 8 hours, harvesting this 3 times a day (assuming the player sleeps 8) gives  XP/hr/w (XP per worker per hour). (In comparison a solar power plant gives XP/hr/w.) Making this building once upgraded one of the best XP/hr/w generating buildings in the game.

Trivia

 * This is the first decoration that can be upgraded, takes up population and has a collectable reward. This is more characteristic for a shop.