garden pavilion
light, sometimes ornamental, structure in a garden, park, or place of recreation that is used for entertainment or shelter
folly
building constructed primarily for decoration
gloriette
park feature, often a type of pavillion
chateau with former prison tower and garden pavilion
chateau with outbildings in Kehrsatz in the canton of Bern, Switzerland
Temple de l'Amour
folly located in Yvelines, in France
orangery
a protected place and especially a greenhouse for growing oranges in cool climates
folly hermitage
rustic building built as folly, usually as part of an estate, from rough materials, intended to appear as the habitation of a hermit