Minecraft! Yes, Minecraft has plenty of hidden underground structures and resources waiting to be discovered. Here are some of the most exciting ones:

1. Abandoned Mineshafts: Generate naturally in caves and contain valuable resources like coal, iron, and diamonds.

2. Strongholds: Hidden underground structures generated by the game, containing libraries, corridors, and a hidden End Portal.

3. Village Temples: Hidden rooms beneath village temples, containing treasures like diamonds, gold, and obsidian.

4. Caves: Generate naturally and contain valuable resources like coal, iron, and precious gems.

5. Ravines: Deep, narrow trenches in the ground, often containing exposed coal, iron, and diamonds.

6. Underwater Ruins: Sunken structures containing treasures like gold, diamonds, and obsidian.

7. Buried Treasure: Randomly generated chests filled with valuable resources, hidden beneath the ground.

8. Fossil Structures: Fossilized trees and leaves, containing resources like coal and diamonds.

9. Cave Systems: Extensive networks of caves, containing hidden resources and secrets.

10. Underground Lakes: Hidden bodies of water, often containing valuable resources like fish and treasure chests.

To find these hidden underground structures and resources, you'll need to explore, mine, and dig your way through the Minecraft world. Happy mining!