Question: The written agreement, The Surrender of Caserta, was signed at the former royal residence located where?

Context paragraphs:
Reggia di Quisisana: The Reggia di Quisisana is a former royal residence located in the frazione of Quisisana, outside of Castellammare di Stabia, in the metropolitan city of Naples, region of Campania, Italy.

Royal Palace of Caserta: The Royal Palace of Caserta (Italian: "Reggia di Caserta" ] ; Neapolitan: "Reggia 'e Caserta" ) is a former royal residence in Caserta, southern Italy, constructed for the Bourbon kings of Naples.  It is one of the largest palaces erected in Europe during the 18th century.  In 1997, the palace was designated a UNESCO World Heritage Site; its nomination described it as "the swan song of the spectacular art of the Baroque, from which it adopted all the features needed to create the illusions of multidirectional space".  In terms of volume, the Royal Palace of Caserta is the largest royal residence in the world with over 2 million m³ and covering an area of about 235,000 m².

Dronninglund Castle: Dronninglund Castle (Danish: Dronninglund Slot) is a former royal residence located in the town of Dronninglund in the northern part of the Jutland Peninsula, Denmark.

Province of Caserta: The Province of Caserta (Italian: "Provincia di Caserta" ) is a province in the Campania region of Italy.  Its capital is the city of Caserta, situated about 36 km by road north of Naples.  The province has an area of 2639 km2 , and a total population of 906,596 as of 2012.  The former Palace of Caserta is located near to the city, a former royal residence which was constructed for the Bourbon kings of Naples.  It was the largest palace and one of the largest buildings erected in Europe during the 18th century.  In 1997, the palace was designated a UNESCO World Heritage Site.

Unhyeongung: Unhyeon Palace (), also known as Unhyeongung Royal Residence, is a former Korean royal residence located at 114-10 Unni-dong, Jongno-gu, Seoul, Korea.  It was formerly the residence of the Heungseon Daewongun a prince regent of Korea during the Joseon Dynasty in the 19th century, and father of Emperor Gojong.  Gojong himself also lived in this residence until age 12 when he assumed the throne.  It is currently a museum and is open to the public free of charge.

Royal Pavilion: The Royal Pavilion, also known as the Brighton Pavilion, is a Grade I listed former royal residence located in Brighton, England.  Beginning in 1787, it was built in three stages as a seaside retreat for George, Prince of Wales, who became the Prince Regent in 1811.  It is built in the Indo-Saracenic style prevalent in India for most of the 19th century.  The current appearance of the Pavilion, with its domes and minarets, is the work of architect John Nash, who extended the building starting in 1815.

Bagshot Park: Bagshot Park is a royal residence located near Bagshot, a village 11 mi south of Windsor and approximately 11 mi north west of Guildford (Grid reference: [ SU 9164] ).  Owned by the Crown Estate it is the current home of Prince Edward, Earl of Wessex and the Countess of Wessex.  Bagshot Park is on Bagshot Heath, a fifty square-mile tract of formerly open land in Surrey and Berkshire.  Bagshot Park occupies 21 hectares within the designated area of Windsor Great Park.  It is only a few miles from Sunninghill Park, the former residence of the Duke and Duchess of York.

Surrender of Caserta: The Surrender of Caserta (Italian: "Resa di Caserta" ) of April 29, 1945 was the written agreement that formalized the surrender of German forces in Italy, ending the Italian Campaign of World War II.  The document, signed at the Royal Palace of Caserta, was to become effective on May 2, 1945.

Royal Pavilion, Aldershot: The Royal Pavilion, also known as the Queen's Pavilion, was a royal residence located at Aldershot in Hampshire.  The most unpretentious of all royal residences, it was built by George Myers as a wooden structure in 1855 for Queen Victoria and Prince Albert for use by members of the Royal Family when in Aldershot to attend military reviews and other occasions.  Located off the Farnborough Road opposite the former West Cavalry Barracks, nearby are the Royal Garrison Church and the Wellington Statue.  It was dismantled in the early 1960s.  Today the site is the location of the Royal Pavilion Office Park.

Château de Marly: The Château de Marly was a relatively small French royal residence located in what has become Marly-le-Roi, the commune that existed at the edge of the royal park.  The town that originally grew up to service the château is now a dormitory community for Paris.

Supporting paragraphs: Surrender of Caserta Royal Palace of Caserta
Answer: southern Italy