Staffan Widstrand / Northern Viscacha or Vizcacha (Lagidium peruanum) resting in an old man made structure, Machu Picchu UNESCO World Heritage Site, Peru. February.

Luiz Claudio Marigo / Andean cloud forest near Machu Picchu, Cusco, Peru

Luiz Claudio Marigo / Andean cloud forest near Machu Picchu, Cusco, Peru

Pete Oxford / Inca ruins (taken from south) Huuauna Picchu in background. Machu Picchu, Peru, South America

Pete Oxford / Machu Picchu ruins Andes, Peru. South America

Pete Oxford / Llama in mist at Machu Picchu, Andes, Peru

Pete Oxford / Machu Picchu (ancient Inca ruins) from the south with peak of Huayna Picchu in background. Peru, South America

Pete Oxford / Masdevallia orchid flower {Masdevallia veitchiana} Machu Picchu, Peru, Sth America

Oscar Dewhurst / Northern viscacha (Lagidium peruanum) feeding on grasses, Machu Picchu UNESCO World Heritage Site, Peru, 02/14

Oscar Dewhurst / Northern viscacha (Lagidium peruanum) on rock at Machu Picchu UNESCO World Heritage Site, Peru. February

Shane P. White / Llama (Lama glama) and Incan ruins, Machu Picchu, Peru

Lucas Bustamante / Llama (Lama glama) resting in Machu Picchu ruins. Urubamba, Peru.

Lucas Bustamante / Three Llamas (Lama glama) resting in the Machu Picchu ruins. Urubamba, Peru. August, 2016.

Will Burrard-Lucas / Llama (Lama glama) in front of Machu Picchu ruins, Andes, Peru, July 2006.

Merryn Thomas / Machu Picchu in morning. Cusco Region, Urubamba Province, Peru. December 2013.

Merryn Thomas / Morning light on Machu Picchu. Cusco Region, Urubamba Province, Peru. December 2013.

Merryn Thomas / Morning at Machu Picchu, Cusco Region, Urubamba Province, Peru. December 2013.

Merryn Thomas / Sacred Valley from Machu Picchu, Inca Trail, Peru. December 2013.

Lucas Bustamante / Northern viscacha (Lagidium peruanum) sitting on the walls of Machu Picchu, Urubamba , Peru.

Sandesh Kadur / Panoramic view of Machu Picchu, UNESCO World Heritage Site. Cusco, Peru. July 2009.

Roland Seitre / Temple of the Condor, Machu Picchu, with Andean Vulture (Vultur gryphus) carving, Cusco, Peru

Roland Seitre / Temple of the Condor, Machu Picchu, with Andean Vulture (Vultur gryphus) carving, Cusco, Peru

Glenn Bartley / Torrent Duck (Merganetta armata) female drying wings, Machu Picchu, Peru

Glenn Bartley / Torrent Duck (Merganetta armata) females and male, Machu Picchu, Peru

Glenn Bartley / Torrent Duck (Merganetta armata), Machu Picchu, Peru

Colin Monteath / Machu Picchu, Urubamba Valley near Cuzco, Peru

Colin Monteath / Huayna Picchu peak and Urubamba Valley from terraces below Machu Picchu near Cuzco, Peru

Colin Monteath / Alpaca (Lama pacos) trio above Machu Picchu near Cuzco, Peru

Colin Monteath / Machu Picchu above Urubamba Valley, view from Huayna Picchu peak near Cuzco, Peru

Colin Monteath / Machu Picchu at dawn above Urubamba Valley near Cuzco, Peru

Pete Oxford / Common / Southern mountain viscacha {Lagidium viscacia} on rocks at Machu Picchu, Peru

Thomas Marent / Llama (Lama glama) overlooking the ruins of Machu Picchu, Peru

Shaun Barnett / Ruins of Machu Picchu, 9000 feet up in tropical rainforest, Peru

Thomas Marent / Ruins of Machu Picchu, 9000 feet up in tropical rainforest, Peru

Thomas Marent / Tourists at ruins of Machu Picchu, 9000 feet up in tropical rainforest, Peru

Thomas Marent / Millipede, Machu Picchu, Peru

Thomas Marent / Bromeliad (Bromeliaceae) pair growing on moss covered branches, Machu Picchu, Peru

Thomas Marent / Dew glistening on a blade of grass, Machu Picchu, Peru

Matthew Maran / Huinay Huayna, the last ruins before Machu Picchu on the final day of the Inca Trail, Andes, Peru

David Noton / Inca ruins, Machu Picchu, Peru

David Noton / Inca ruins, Machu Picchu, Peru

David Noton / Llama in front of Inca ruins, Machu Picchu, Peru

David Noton / Machu Picchu, Peru

David Noton / Storm clouds over the mountains (Andes) nr Machu Picchu, Peru

David Noton / Storm clouds over Machu Picchu, Peru

David Noton / Storm clouds over Machu Picchu, Peru

David Noton / Storm clouds over Machu Picchu, Peru

David Noton / Storm clouds over Machu Picchu, Peru

David Noton / Storm clouds over Machu Picchu, Peru

David Noton / Machu Picchu, Peru

David Noton / Inca ruins at Machu Picchu, Peru

Juan Manuel Borrero / Inca ruins, Huuauna Picchu in background, Machu Picchu, Peru 2006.

Juan Manuel Borrero / View of Huuauna Picchu through gap in ancient Inca stone wall, Machu Picchu, Peru 2006.

Juan Manuel Borrero / View of Huuauna Picchu through gap in ancient Inca stone wall, Machu Picchu, Peru 2006.

Juan Manuel Borrero / Llama (Lama glama) on inca ruins, Machu Picchu, Peru 2006.

Juan Manuel Borrero / Man photographing llama (Lama glama), Machu Picchu, Peru 2006.

Juan Manuel Borrero / Llama (Lama glama) in Machu Picchu, Peru 2006.

Juan Manuel Borrero / Inca ruins, Machu Picchu, Peru, 2006

Juan Manuel Borrero / Ruins of Machu Picchu, Lost City of the Incas, Peru 2006.

Juan Manuel Borrero / Inca ruins, Machu Picchu, Peru 2006.

Juan Manuel Borrero / Inca ruins, Machu Picchu, Peru 2006.

Juan Manuel Borrero / Inca ruins, Huuauna Picchu in background, Machu Picchu, Peru 2006.

Juan Manuel Borrero / Inca ruins, Huuauna Picchu in background, Machu Picchu, Peru 2006.

Hanne & Jens Eriksen / Ruins of Machu Picchu, Lost City of the Incas, Andes, Peru

Pete Oxford / Machu Picchu as viewed from the south, Peru

Pete Oxford / Steps to Huayna Picchu (Young Mountain), Machu Picchu, Peru

Pete Oxford / Inca stone masonry with wall lizard, Machu Picchu, Peru

Doug Allan / Machu Picchu, Lost City of the Incas, Peru

David Tipling / Panoramic view of Machu Picchu, Peru, South America

David Tipling / Panoramic view of Machu Picchu, Peru, South America

Doug Allan / Machu Picchu "Lost City of the Incas", Andes, Peru, South America

David Tipling / Original Inca wall pattern, Machu Picchu, Peru, South America

Pete Oxford / Looking down ancient remains of Machu Picchu, Peru

Pete Oxford / Machu Picchu and domestic llama seen from south with Huayna Picchu (Young Mountain) behind, Peru

Pete Oxford / Looking down on cloud and tropical rainforest clad hills, surrounding Machu Picchu, Peru, South America

Hanne & Jens Eriksen / Machu Picchu, Inca ruins Andes, Peru

Pete Oxford / Machu Picchu ancient Inca Ruins and llama seen from south with Huayna Picchu in background, Peru

Conrad Maufe / Alpaca herd at Machu Picchu, Andes, Peru

Conrad Maufe / Machu Picchu, Andes, Peru

DAVID TIPLING / Machu Picchu scenic Cuzco, Peru

Jan Vermeer / Tourists visiting the ruins of Machu Picchu, 9000 feet up in tropical rainforest, Peru

Robert Fulton / Aerial view - patchwork of arable fields, near Machu Picchu, Peru, South America

Pete Oxford / Orchid {Maxillaria longipetala} Machu Picchu, Peru, South America

Pete Oxford / Watersystem at Machu Picchu archaelogical site, Peru

Pete Oxford / Ancient ruins of Guards' houses Machu Picchu Peru

Pete Oxford / Forested hillsides surrounding Machu Picchu, Peru

Pete Oxford / Machu Picchu ruins with Huayna Pichu in background. Peru

Pete Oxford / Machu Picchu, Peru

Pete Oxford / Machu Picchu, Peru

Pete Oxford / Inca bridge, Machu Picchu Andes, Peru

Pete Oxford / Machu Picchu (ancient Inca ruins) from the south with peak of Huayna Picchu in background. Peru, South America

Pete Oxford / The Inca bridge. Machu Picchu, Peru, South America

Pete Oxford / Huayana Picchu seen through stone arch. Machu Picchu, Peru.

Pete Oxford / Machu Picchu with Huanya Picchu in background, Peru, South America

Pete Oxford / Orchid flower (Lycaste sp.). Machu Picchu, Peru, Central America

Pete Oxford / Orchid growing in cloud forest at Machu Picchu, Peru