QGA935698: Differential reel / Bridgeman Images

QGA935487: Aristides or Aristeides (born 530 BC, died 468 BC), Athenian statesman / Bridgeman Images

QGA936935: Alphabet character, letter D / Bridgeman Images

QGA936019: Coat of Arms of Gumbinnen / Bridgeman Images

QGA936434: Autograph: Arthur Schopenhauer / Bridgeman Images

QGA935175: Detail from the church in Vienne / Bridgeman Images

QGA935344: Abanga, a member of a tribe in what is now Gabon, Africa / Bridgeman Images

QGA935913: Neolithic and Bronze Age find from the stilt houses in Lake Constance / Bridgeman Images

QGA935095: Alphabetic character, letter R / Bridgeman Images

QGA935146: Adder, common viper / Bridgeman Images

QGA936478: Gaius Julius Caesar (13 July 100 BC - March 15, 44 BC), Roman statesman, general and author, adoptive father of Augustus, marble bust in the National Museum at Naples / Bridgeman Images

QGA935646: Head of Christ from a manuscript about 1340 / Bridgeman Images

QGA935444: muriquis, woolly spider monkeys / Bridgeman Images

QGA936266: Elecampane / Bridgeman Images

QGA936852: Vasco da Gama (ca. 1469 – 1524), Portuguese explorer / Bridgeman Images

QGA935113: Ornament / Bridgeman Images

QGA936342: Charlemagne. Bronze statuette, now in the Musée Carnavalet in Paris / Bridgeman Images

QGA936125: Còsimo di Giovanni degli Mèdici (1389 – 1464), first of the Medici political dynasty / Bridgeman Images

QGA936727: Jan Hus (1372 - 1415), Czech Catholic priest, philosopher, reformer, and master at Charles University in Prague / Bridgeman Images

QGA935771: Gorilla / Bridgeman Images

QGA935516: Saxon farmhouse / Bridgeman Images

QGA935973: Lapwing / Bridgeman Images

QGA936354: John Ruskin. From a Photograph by Elliott & Fry., Elliott & Fry Studio (fl.1860-1900) (after) / Bridgeman Images

QGA936526: Louis Agassiz (1807–1873), Swiss-U.S. zoologist, glaciologist, and geologist / Bridgeman Images

QGA935028: Sheet of Paper / Bridgeman Images

QGA936139: Wolfgang Amadeus Mozart (1756 – 1791), Austrian composer / Bridgeman Images

QGA935656: Ecce Homo. By Albrecht Dürer, Dürer or Duerer, Albrecht (1471-1528) / Bridgeman Images

QGA935234: Coral Ring Island (Atoll) with coral reefs: Tatakoto Roa (Paumotu) / Bridgeman Images

QGA936726: Alexander von Humboldt (1769–1859), German natural scientist / Bridgeman Images

QGA936795: Nero (37 - 68), Roman emperor / Bridgeman Images

QGA935964: Black Grouse / Bridgeman Images

QGA936731: Hans Holbein the Younger (c. 1497–1543), son of Hans Holbein the Elder, court artist to King Henry VIII of England / Bridgeman Images

QGA935447: Barbary ape / Bridgeman Images

QGA936079: Heinrich von Kleist (1777–1811), German writer / Bridgeman Images

QGA935732: Perch: skeleton / Bridgeman Images

QGA935544: Portrait of a Swabian (southwest Germany) in traditional costume / Bridgeman Images