Fireflies light up a forest in Temuco, Chile. | (REUTERS/Cristobal Saavedra Escobar)

The Aurora Borealis over Enontekio, Finland. | (REUTERS/Alexander Kuznetsov)

A bat glides across the sky above Sydney, Australia. | (AP Photo/Mark Baker)

A man falls off a sled in Milton Keynes, Britain. | (REUTERS/Andrew Boyers)

A dancer participates in an aboriginal ceremony in Sydney. | (AP Photo/Rick Rycroft)

A tree lies over a creek near Frankfurt, Germany. | (AP Photo/Michael Probst)

A towboat breaks ice in Ornskoldsvik, Sweden. | (Erik Martensson/TT News Agency/via REUTERS)

A worker walks on shipping containers in Jakarta, Indonesia. | (REUTERS/Ajeng Dinar Ulfiana)

A land-art fresco in Cape Town, South Africa. | (Valentin Flauraud for Saype/via REUTERS)

Conceptual artists perform in Regensdorf, Switzerland. | (REUTERS/Arnd Wiegmann)

A security guard walks on an observation deck in Tokyo. | (REUTERS/Issei Kato)

A tug of war club trains in Boley, Ireland. | (REUTERS/Clodagh Kilcoyne)

**See last week's best photojournalism**