A ha-ha, also known as a sunk fence, blind fence, ditch and fence, deer wall, or foss, is a recessed landscape design element that creates a vertical barrier while preserving an uninterrupted view of
Comparison of a ha-ha (top) and a regular wall (bottom). Both walls prevent access, but one does not block the view looking outward.
A wall with a ha-ha opening at the Hameau de la Reine, Versailles
Ha-ha protecting the lawn at Hopetoun House, West Lothian, Scotland. Note how the wall disappears from view as it curves away to the left of the photograph.
Ha-ha and south face of Parham Park, West Sussex, England
The Washington Monument is a 555-foot tall obelisk on the National Mall in Washington, D.C., built to commemorate George Washington, a Founding Father of the United States and the nation's first presi
Ha-ha
…House], which was an eight-foot wall with a sunken ditch meant to keep the livestock from grazing in his garden." A 21st-century use of a ha-ha is at the Washington Monument to minimise the visual impact of security measures. After 9/11 and another unrelated terror threat at the monument, authorities put up jersey barriers…
The Washington Monument in Washington, D.C., in 2022
Print of the proposed Washington Monument by architect Robert Mills, c. 1845–1848
Donation receipt of the Washington National Monument Society
Bronze statue of George Washington in the monument's western alcove