The LEGO Technic Bucket Wheel Excavator is pretty amazing.

LEGO Technic Bucket Wheel Excavator 42055

• LEGO Power Functions such as forward and reverse driving, rotating bucket wheel, moving conveyor belt and rotating superstructure
• The largest LEGO Technic set ever made
• LEGO Technic building toys are compatible with all LEGO construction sets for creative building
• Bucket Wheel Excavator measures over 16” high, 28” long and 11” wide. Mobile Aggregate Processing Plant with boom retracted measures over 8” high, 34” long and 8” wide, and over 12” high with boom extended. Mine Truck measures over 3” high, 7” long and 3” wide
• 3929 pieces