“The Meaning of North,” August 2014, Photograph by Cory Richards.

“Visions on Earth,” October 2013, Photographs by Abelardo Morell.

“Ghost Cats,” December 2013, Photographs by Steve Winter.

“Empire of Rock,” July 2014, Photographs by Carsten Peter.

“The First Bird,” January 2015, Photographs by Klaus Nigge.

“Follow the Water: Journey to the Heart of Norway,” November 2013, Photographs by Erlend and Orsolya Haarberg.

“Yukon: Canada’s Wild West,” February 2014, Photographs by Paul Nicklen.

“Before Stonehenge,” August 2014, Photographs by Jim Richardson.

“Gombe Family Album,” August 2014, Photographs by Anup Shah and Fiona Rogers.