Observes posters & prints

The old observing-room, Greenwich Anonymous

Horse sticking head out stable window Anonymous

Killer Whale Breaching, British Columbia, Canada. Anonymous

Taking Observations with a Sextant Andrew Pitcairn-Knowles

Observing with the dipleidoscope Unknown

An Indian spy observes the arrival of a Spanish ship on the Mexican coast, 1579 Diego Duran

Observing a solar eclipse, 1673 Unknown

Newsboy selling 'The Observer' English School

First Navy Observation Balloon Anonymous

Temporary observatory for pendulum observations, Sumatra unknown

Observers, 2011 Vincent Alexander Booth

Henry VIII and Anne Boleyn Observed by Queen Catherine, 1870 Marcus Stone

I.K. Brunel and Others Observing the Great Eastern Launch Attempt Robert Howlett

On the Lookout Wilhelm Kuhnert

Paris Observatory, France, 1740 Unknown

Observer's Mate WA & AC Churchman

Family Observing a School Construction Site Anonymous

Commander Evans observing an Occulation of Jupiter, Antarctica, 1910-1912 Herbert Ponting

Observing a total solar eclipse, 1851 (1857) Anonymous

Observations on certain curious Indentations in the Old Red Sandstone of Worcestershire and Herefordshire, considered as the tracks of antediluvian... Anonymous

Michael and Mrs. Faraday Observing Experiment Anonymous

Plate XXXVIII from Campi Phlegraei: Observations of the Volcanoes of the two Sicilies Pietro Fabris

Chess, 1812 John Harden

A look-out on the bridge of a British warship Gregory & Co

Artillery observation officer in forward post, France, World War I Realistic Travels Publishers

Napoleon III at the Battle of Solferino Jean Louis Ernest Meissonier

Skyway and Observation Towers at Century of Progress Anonymous

Fable El Greco

Lovers observed George Morland

1960s Family Mother Father Son Daughter Watching Television In Living Room Indoor Anonymous

Commander Evans observing an Occulation of Jupiter Herbert Ponting

The Sketcher, Portrait of Mademoiselle Rosina Daniel Huntington

King of Siam (Thailand) observes the lunar eclipse from his palace Aart Dircksz Oossaan

US Observation Planes Flying in Battle Formation Anonymous

Observation of Yellow Fever, c.1819 Charles Lasteyrie du Saillant

1960s Man Jumping Waving Checkered Flag As Winning Sports Car Crossing The Finish Line Anonymous