A Bai girl carrying buckets of water in front of a water wheel in Lijiang Old Town, UNESCO World Heritage Site, Yunnan Province, China, Asia

A massive bucket wheel by the Syncrude upgrader plant, Alberta, Canada, North America

Aerial view of a bucket-wheel excavator with conveyor belt in for open-pit lignite mining, brown coal, Schoeningen, Lower Saxony, Germany

Aerial view of a bucket-wheel excavator with conveyor belt in for open-pit lignite mining, brown coal, Schoeningen, Lower Saxony, Germany

Bucket-wheel excavator, lignite mining, Garzweiler, near Jüchen, Erkelenz, North Rhine-Westphalia, Germany, Europe

Bucket-wheel excavators, Garzweiler lignite mining, near Jüchen, Erkelenz, North Rhine-Westphalia, Germany, Europe

Big Wheel bucket-wheel excavator, Ferropolis, City of Iron, Saxony-Anhalt, Germany, Europe

Bucket-wheel excavator in the open pit Welzow-Sued, mining of brown coal by the Vattenfall energy company, Lower Lusatia, Lusatia, Brandenburg, Germany, Europe

Bucket-wheel excavator in the mist, Tagebau Garzweiler open pit mine, Grevenbroich, North Rhine-Westphalia, Germany, Europe

Big Wheel bucket-wheel excavator, Ferropolis, City of Iron, Saxony-Anhalt, Germany, Europe

Big Wheel bucket-wheel excavator, Ferropolis, City of Iron, Saxony-Anhalt, Germany, Europe