Gassed

Gassed is a 231 × 611 cm (7.6 × 20 ft) oil painting completed in March 1919 by John Singer Sargent. Painted after Sargent visited the Western Front on a commission by the British War Memorials Committee, it depicts the aftermath of a mustard gas attack during the First World War, with a line of wounded soldiers walking towards a dressing station. The painting, voted picture of the year by the Royal Academy of Arts in 1919, is now held by the Imperial War Museum.

Carina Nebula

The Carina Nebula is a large bright nebula that has within its boundaries several relatedopen clusters of stars. Discovered by Nicolas Louis de Lacaille in 1751–52, it is only visible from the Southern Hemisphere. Located an estimated 6,500 to 10,000 light yearsfrom Earth, it is one of the largest diffuse nebulae in the planet's skies and home to such stars as Eta Carinae and HD 93129A.

Slender Mongoose

The slender mongoose (Galerella sanguinea) is a common species ofmongoose found throughout much of sub-Saharan Africa. Dozens of subspecies are known, and the fur color varies between subspecies. The slender mongoose tends to live alone or in pairs, and, although it is an opportunistic omnivore, it feeds primarily on insects.

This specimen was photographed at thePrague Zoo in the Czech Republic.

Point Pinos Lighthouse

Point Pinos Lighthouse is a lighthouse located in Pacific Grove, California. Lit in 1855, it is the oldest continuously operating lighthouse on the West Coast of the United States, and was added to the National Register of Historic Places in 1977.

Neutral density filter

A neutral density filter is a filter that reduces or modifies the intensity of all wavelengths or colors of light equally, giving no changes in hue of color rendition. The filter reduces the amount of light entering the lens, allowing the photographer to select combinations of aperture, exposure time and sensor sensitivity to avoid overexposed pictures. It would normally be attached to the lens, but is hand-held here to illustrate the effect.

Mount John Laurie

Mount John Laurie is a mountain found in Alberta, Canada. Part of the Canadian Rockies, it is a popular rock climbing destination.

Black-breasted Thrush

Male (top) and female Black-breasted Thrush (Turdus dissimilis), photographed at the Royal Agricultural Station in Ang Khang, Thailand. The common name of this species, which was first described in 1847 by Edward Blyth, is derived from the male's breast plumage.

Yeoman Warder

A Yeoman Warder in Tudor State Dress, photographed about 1890–1900, (coloured later). The Yeomen Warders, formed by Henry VII in 1485, are tasked with guarding the Tower of London and the crown jewels contained within. Today's Yeomen Warders must be retired non-commissioned officers from the armed forces of the Commonwealth realms who have at least 22 years of service.

Harhoog

Harhoog is an extended dolmen, a rectangular megalithic tomb from the Funnelbeaker culture, located near Keitum on the island of Sylt in Schleswig-Holstein, Germany. Discovered near the mud flats between Keitum and Tinnum in 1925, the tomb was moved to the present site in 1954 when a new airport was developed.

Taj Mahal

Western view of the Taj Mahal, viewed during the golden hour. Symbolically, the constantly changing sunlight reflected by the mausoleum's marble has a metaphoric role which associates light with the presence of God. Located in Agra, Uttar Pradesh, the Taj Mahal was constructed in the 17th century by Shah Jahan and has been called the finest example of Mughal architecture. In 1983 it was designated a UNESCO World Heritage Site.