Tim Martin / Rainbow over Hadrian's Wall and moorland, near Housesteads Roman Fort, Northumberland, UK. February 2006.

Hans Christoph Kappel / Temple of Hadrian at Ephesus, ancient Greek site, Turkey

David Noton / Hadrian's Wall at Housesteads, Northumberland, England, UK

Nick Turner / Hadrian's wall, view east from Walltown Crags, Northumberland, UK.

David Noton / Hadrian's wall at Housesteads, Northumberland, UK.

Nick Turner / Hadrian's wall, view west from Walltown Crags, Northumberland, UK

Nick Turner / Hadrian's wall detail at Walltown Crags, Northumberland, UK. 10/03

Nick Turner / Hadrian's wall, view east from Walltown Crags, Northumberland, UK.

Nick Turner / Hadrian's wall, view east from Walltown Crags, Northumberland, UK.

Nick Turner / Hadrian's wall, looking west from Walltown Crags, Northumberland, UK 2003

Angelo Giampiccolo / A view of the Castel Sant'Angelo and the angel statues on the Ponte Sant' Angelo (angel's bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Ro...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo and the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo and the angel statues on the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roma...

Angelo Giampiccolo / View of the Castel Sant'Angelo and the Ponte Sant' Angelo (Angel's bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo and the Ponte Sant' Angelo (Angel's bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / Castel Sant'Angelo and the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as a mausoleum...

Angelo Giampiccolo / Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as a mausoleum...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo and the angel statues on the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roma...

Angelo Giampiccolo / A seagull perching on one of the statues that adorns the Ponte Sant' Angelo (Angel's bridge), Rome, Italy. The bridge, also known as Pons Aelius, spans the river Tiber and leads to the Castel Sant'Ang...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo from the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Angelo Giampiccolo / View of the Castel Sant'Angelo with angel statue in foreground, Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as a mausoleum...

Angelo Giampiccolo / View of the Castel Sant'Angelo and the Ponte Sant' Angelo (Angel's Bridge), Rome, Italy. ^^^The castle is also known as the Mausoleum of Hadrian as it was commissioned by the Roman Emperor Hadrian as...

Konrad Wothe / Brown Mouse Lemur (Microcebus rufus), Madagascar

Mark Carwardine / Madame Berthe's mouse lemur {Microcebus berthae} being released from live trap, Kirindy Forest, western Madagascar, Smallest primate in the world, Endangered

Mark Carwardine / Madame Berthe's mouse lemur {Microcebus berthae} after release from live trap, Kirindy Forest, western Madagascar. Smallest primate in the world, Endangered

Mark Carwardine / Madame Berthe's mouse lemur {Microcebus berthae} being released from live trap, Kirindy Forest, western Madagascar. Smallest primate in the world, Endangered

Mark Carwardine / Madame Berthe's mouse lemur {Microcebus berthae} being released from live trap, Kirindy Forest, western Madagascar. Smallest primate in the world, Endangered

Mark Carwardine / Madame Berthe's mouse lemur {Microcebus berthae} being released from live trap, Kirindy Forest, western Madagascar. Smallest primate in the world, Endangered

Loic Poidevin / Grey / Lesser mouse lemur (Microcebus murinus) sucking sap from tree, Madagascar.

Inaki Relanzon / Goodman's mouse lemur (Microcebus lehilahytsara) clinging to branch, Andasibe Mantadia National Park, Madagascar, September

Rod Williams / Grey / Lesser Mouse Lemur (Microcebus murinus) Captive, occurs Western Madagascar

Pete Oxford / Lesser mouse lemur {Microcebus murinus} looking up at night, Kirindy Forest, Madagascar

Gerry Ellis / Gray Mouse Lemur (Microcebus murinus) eating, Woodland Park Zoo, Seattle, Washington

Andy Rouse / Grey mouse lemur (Microcebus murinus) on branch in spiny forest at night, Madagascar

Thomas Marent / Goodman's Mouse Lemur (Microcebus lehilahytsara) pair in nest, new species discovered in Aug 2005, Masoala National Park, Madagascar

Thomas Marent / Goodman's Mouse Lemur (Microcebus lehilahytsara) in nest, new species discovered in Aug 2005, Masoala National Park, Madagascar

Thomas Marent / Brown Mouse Lemur (Microcebus rufus) at night, Berenty Private Reserve, Madagascar

Jouan & Rius / Gray / Lesser mouse lemur (Microcebus murinus) at night, Nahampoana reserve, Madagascar South

Thomas Marent / Pygmy Mouse Lemur (Microcebus myoxinus) portrait, Morondava, Madagascar

Jouan & Rius / Lesser / Grey mouse lemur (Microcebus murinus) in tree at night, Nahampoana reserve, South Madagascar

Jouan & Rius / Lesser mouse lemur (Microcebus murinus) on branch at night, tropical dry forest, Madagascar

Nick Garbutt / Grey-brown Mouse Lemur {Microcebus griseorufus} portrait in tree, Spiny forest, south western Madagascar

Rod Williams / Lesser / Grey mouse lemur {Microcebus murinus} captive, from NW Madagascar

Rod Williams / Coquerel's dwarf / mouse lemur {Microcebus coquereli} captive, from Madagascar

Rod Williams / Coquerel's dwarf / mouse lemur {Microcebus coquereli} captive, from Madagascar

Rod Williams / Coquerel's dwarf / mouse lemur {Microcebus coquereli} juvenile, captive, from Madagascar

Pete Oxford / Russet mouse lemur {Microcebus rufus} Kirindy, Madagascar

Pete Oxford / Russet mouse lemur {Microcebus rufus} held in hand to show small size, Kirindy, madagascar

Pete Oxford / Russet mouse lemur {Microcebus rufus} Montagne D'ambre NP, Madagascar

Pete Oxford / Russet mouse lemur held in hand {Microcebus rufus} captive, Kirindy Dry Forest Reserve, Madagascar

Gerry Ellis / Gray Mouse Lemur (Microcebus murinus) preparing to pounce on insect prey, native to Madagascar

Gerry Ellis / Gray Mouse Lemur (Microcebus murinus) on branch, endemic species in Madagascar

Rod Williams / Lesser mouse / Grey lemur {Microcebus murinus} looking out of hole in tree trunk, captive, from Western Madagascar

Rod Williams / Coquerel's dwarf lemur, vulnerable species native to Madagascar

Bernard Walton / Presenter Charlotte Unlenbroek with Pygmy mouse lemur {Microcebus myoxinus}, on location in Madagascar, filming for BBC television series "Cousins", 1999