Swimmers stroke their way through the Berlin Triathlon, held annually in June. The swimming portion takes competitors through Treptower Park along the River Spree.

Berlin, Germany

Swimmers stroke their way through the Berlin Triathlon, held annually in June. The swimming portion takes competitors through Treptower Park along the River Spree.
Photograph by Gerhard Westrich, laif/Redux

Week's Best Travel Photos: A Start to Summer

Get your dose of outstanding travel photos. This week: Start the Northern Hemisphere's summer off right with national parks and a splash in the river.

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