Question: The Waterloo Vase has been used as a garden ornament at whose residence and administrative headquarters?

Documents:
source: Buckingham Palace
text: Buckingham Palace Buckingham Palace ( ) is the London residence and administrative headquarters of the reigning monarch of the United Kingdom. Located in the City of Westminster, the palace is often at the centre of state occasions and royal hospitality. It has been a focal point for the British people at times of national rejoicing and mourning.

source: Waterloo Vase
text: Waterloo Vase The Waterloo Vase is a great urn, 15ft (5m) high and weighing 20 tons, fashioned from a single piece of Carrara marble. Since 1906, it has been used as a garden ornament in the garden of Buckingham Palace, London.

source: Borghese Vase
text: Borghese Vase The Borghese Vase is a monumental bell-shaped krater sculpted in Athens from Pentelic marble in the second half of the 1st century BC as a garden ornament for the Roman market; it is now in the Louvre Museum.

source: Medici Vase
text: Medici Vase The Medici Vase is a monumental marble bell-shaped krater sculpted in Athens in the second half of the 1st century AD as a garden ornament for the Roman market. It is now in the Uffizi Gallery in Florence.

source: Bird bath
text: Bird bath A bird bath is an artificial puddle or small shallow pond, created with a water-filled basin, in which birds may drink, bathe, and cool themselves. A bird bath can be a garden ornament, small reflecting pool, outdoor sculpture, and part of creating a vital wildlife garden.

source: Suikinkutsu
text: Suikinkutsu A suikinkutsu (水琴窟 , literally "water koto cave") is a type of Japanese garden ornament and music device. It consists of an upside down buried pot with a hole at the top. Water drips through the hole at the top onto a small pool of water inside of the pot, creating a pleasant splashing sound that rings inside of the pot similar to a bell or a Japanese zither called koto. It is usually built next to a traditional Japanese stone basin called "chōzubachi", part of a "tsukubai" for washing hands before the Japanese tea ceremony.

source: Achalla
text: Achalla Achalla is the capital of Awka North, a Local Government Area in Anambra State, south-central Nigeria. It comprises eight villages: Umudiani, Amukabia, Odawa, Umuogbe, Umunagu, Umuezede, Udezu and Amadim. Achalla's current Monarch is HRH Igwe Alex Nwokedi(OON). However, the traditional monarchical heritage of Achalla is linked to the MUOLOKWU dynasty in ODAWA village. Historically, Achalla is said to have migrated from Arochukwu kingdom in present-day Abia state. In early ages, some Achalla people is also believed to have emigrated to form a community known to this day as Achalla-ibuzo in present Delta state. Some of its prominent sons include the current King, Igwe Alex Nwokedi who was a former chief press secretary to former head of State, General Olusegun Obasanjo, and also a retired Nigeria Custom Service boss, Comptroller Edwin U. Achum(retired) who was a philanthropist and known as the "Ozumba 1" of Achalla, and whose residence was once used as the secretariat of the local government until the government was able to build a permanent place to serve as the local government secretariat.

source: Garden ornament
text: Garden ornament A Garden ornament is an item used for garden, landscape, and park enhancement and decoration. <br>

source: Wind chime
text: Wind chime Wind chimes are a type of percussion instrument constructed from suspended tubes, rods, bells or other objects that are often made of metal or wood. The tubes or rods are suspended along with some type of weight or surface which the tubes or rods can strike when they or another wind-catching surface are blown by the natural movement of air outside. They are usually hung outside of a building or residence as a visual and aural garden ornament. Since the percussion instruments are struck according to the random effects of the wind blowing the chimes, wind chimes have been considered an example of chance-based music. The tubes or rods may sound either indistinct pitches, or fairly distinct pitches. Wind chimes that sound fairly distinct pitches can, through the chance movement of air, create simple melodies or broken chords.

source: Whirligig
text: Whirligig A whirligig is an object that spins or whirls, or has at least one part that spins or whirls. Whirligigs are also known as pinwheels, buzzers, comic weathervanes, gee-haws, spinners, whirlygigs, whirlijig, whirlyjig, whirlybird, or plain whirly. Whirligigs are most commonly powered by the wind but can be hand, friction, or motor powered. They can be used as a kinetic garden ornament. They can be designed to transmit sound and vibration into the ground to repel burrowing rodents in yards, gardens, and backyards.

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Answer: reigning monarch of the United Kingdom