In architecture, a folly is a building constructed primarily for decoration, but suggesting through its appearance some other purpose, or of such extravagant appearance that it transcends the range of usual garden buildings.

The English landscape garden, also called English landscape park or simply the English garden, is a style of "landscape" garden which emerged in England in the early 18th century, and spread across Europe, replacing the more formal, symmetrical French formal garden which had emerged in the 17th century as the principal gardening style of Europe. The English garden presented an idealized view of nature. Created and pioneered by William Kent and others, the "informal" garden style originated as a revolt against the architectural garden and drew inspiration from landscape paintings by Salvator Rosa, Claude Lorrain, and Nicolas Poussin.