Cassiobury Park has an incredible history. Not only is it one of the remnants of the greatest lost estates in the country, it is now one of the most popular parks in the country and locally is the largest park in Hertfordshire, and the principal park of its primary town, Watford. It covers an impressive area which is twice the size of Hyde Park in London.

Arthur Capel was made the Earl of Essex and in time moved to Cassiobury. The Capels had a major impact on Cassiobury. By 1800, the 5th Earl of Essex employed noted and respected architect James Wyatt to rebuild his house. Successive landscape gardeners were employed here, from Moses Cook to Humphry Repton, with the landscape captured by J. M. W. Turner on visits to Cassiobury. By 1881, the parkland was already well established with fine trees, woodland walks, with many deer in the park, often traded with the royal deer parks at Richmond, Bushy and Windsor Great Park. By the beginning of the twentieth century, decline had set in and large areas of the park had been sold off to Watford Borough Council for public parkland - the beginnings of the public park we know today.

Cassiobury Park: The Postcard Collection takes the reader on an evocative journey into the park's rich past through a selection of old postcards that offer a fascinating window into its history and continuing development.

The royal parks of London are lands originally owned by the monarchy of the United Kingdom for the recreation (mostly hunting) of the royal family. They are part of the hereditary possessions of the Crown. With the increasing urbanisation of London, some of these were preserved as freely accessible open spaces and became public parks with the introduction of the Crown Lands Act 1851. Today there are eight parks formally described by this name and they cover almost 2,000 hectares of land in Greater London. Hyde Park, Kensington Gardens, Green Park, Regent's Park and St James's Park are the largest green spaces in central London; Bushy Park, Greenwich Park and Richmond Park are in the suburbs.

London's Royal Parks: The Postcard Collection takes the reader on an evocative journey into the past of these much-loved green spaces through a selection of old postcards that offer a fascinating window into their history and continuing development.