Question: The designer of the Zig Zag-chair is also the designer of what UNESCO World Heritage Site?

Context paragraphs:
Bahrain Pearling Trail: The Bahrain Pearling Trail or Bahrain Pearling Pathway is a serial cultural heritage site inscribed on the UNESCO World Heritage List in 2012.  It consists of 3 oyster beds in the Bahrain northern waters, a segment of the coast and the seafront Bu Mahir fortress in the southern tip of Muharraq, and 17 buildings in Muharraq historical town connected by a 3.5 km visitor pathway.  The Site was inscribed as a UNESCO World Heritage Site on June 30, 2012 and is Bahrain's second World Heritage Site after the Bahrain Fort.

Gerrit Rietveld: Gerrit Thomas Rietveld (] ; 24 June 1888 – 25 June 1964) was a Dutch furniture designer and architect.  One of the principal members of the Dutch artistic movement called De Stijl, Rietveld is famous for his Red and Blue Chair and for the Rietveld Schröder House, which is a UNESCO World Heritage Site.

Waldschlösschen Bridge: The Waldschlösschen Bridge (German: Waldschlößchenbrücke or Waldschlösschenbrücke ) is a road bridge across the Elbe river in Dresden.  The bridge was intended to remedy inner-city traffic congestion.  Its construction was highly controversial, as the Dresden Elbe Valley had been declared a UNESCO World Heritage Site and UNESCO expressed strong concerns against the bridge, noting its intent to withdraw the World Heritage title if the bridge were built.  As a result of this project, the Dresden Elbe Valley was listed in 2006 as an "Endangered World Heritage Site" (one of two in Europe, the Medieval Monuments in Kosovo being the other one), and in 2009 became only the second World Heritage Site to be de-listed.

Elbe Valley: The Elbe Valley (German: "Elbtal" or "Elbetal") is most often used as a term for that section of the river valley in which most of the quarters of Dresden are located.  The Dresden Elbe Valley was declared a UNESCO World Heritage Site in 2005 and has lost the title June 25, 2009 due to a dispute between UNESCO and the City of Dresden.  The city plans to construct bridge across the Elbe river, that will span it in the middle of the former World Heritage Site.  In the opinion of UNESCO this construction will "deface" the historic site.

Wandu: Wandu, called Hwando in Korean, was the second capital of the Goguryeo kingdom.  The remains of the mountain fortress are part of the UNESCO World Heritage Site Capital Cities and Tombs of the Ancient Koguryo Kingdom.  It is located 2.5 kilometers west of Ji'an, Jilin province in Northeast China, near the North Korean border.  It is part of the UNESCO World Heritage Site Capital Cities and Tombs of the Ancient Koguryo Kingdom, together with nearby Guonei City and the Wunü Mountain City.

Białowieża Forest: Białowieża Forest (Belarusian: Белавежская пушча, "Biełaviežskaja Pušča" ; Polish: "Puszcza Białowieska"   ] ; Russian: Беловежская пуща, "Belovezhskaya Pushcha" ) is one of the last and largest remaining parts of the immense primeval forest that once stretched across the European Plain.  The forest is home to 800 European bison, Europe's heaviest land animal.  UNESCO’s Man and the Biosphere Programme (MAB) designated the Polish Biosphere Reserve "Białowieża " in 1976 and the Belarusian Biosphere Reserve "Belovezhskaya Puschcha " in 1993.  In 2015, the Belarusian Biosphere Reserve occupied the area of 216,200 ha , subdivided into transition, buffer and core zones.  The forest has been designated a UNESCO World Heritage Site and an EU Natura 2000 Special Area of Conservation.  The World Heritage Committee by its decision of June 2014 approved the extension of the UNESCO World Heritage site “Belovezhskaya Pushcha/Białowieża Forest, Belarus, Poland”, which became “Białowieża Forest, Belarus, Poland”.  It straddles the border between Poland (Podlaskie Voivodeship) and Belarus (Brest and Grodno "voblast "s), and is 70 km north of Brest, Belarus and 62 km southeast of Białystok, Poland.  The Białowieża Forest World Heritage site covers a total area of 141,885 ha .

Lingering Garden: Lingering Garden (; Suzhou Wu: Leu yoe, ] ) is a renowned classical Chinese garden.  It is located at 338 Liuyuan Rd.  Suzhou, Jiangsu province, China (留园路338号).  It is recognized with other classical Suzhou gardens as a UNESCO World Heritage Site.  In 1997, the garden, along with other classical gardens in Suzhou, was recorded by UNESCO as a World Heritage Site.  The garden also stores two UNESCO Intangible World Heritage Arts; Pingtan (评弹) and Guqin music.

Martin Luther's Death House: Martin Luther's Death House (German: "Martin Luthers Sterbehaus" ) is the historic building in Eisleben, Germany, where it was incorrectly thought that Martin Luther died on 18 February 1546.  Since then it has become a museum and a UNESCO world heritage site.  The city of Eisleben, located in Saxony-Anhalt, is also where Martin Luther was born and baptised; his birth house is also a UNESCO world heritage site and museum.

Zig-Zag Chair: The Zig Zag-chair is a chair designed by Gerrit Rietveld in 1934.

Cornwall and West Devon Mining Landscape: The Cornwall and West Devon Mining Landscape is a World Heritage Site which includes select mining landscapes in Cornwall and West Devon in the south west of England.  The site was added to the World Heritage List during the 30th Session of the UNESCO World Heritage Committee in Vilnius, July 2006.  Following plans in 2011 to restart mining at South Crofty, and to build a supermarket at Hayle Harbour, the World Heritage Committee drafted a decision in 2014 to put the site on the List of World Heritage in Danger, but this was rejected at the 38th Committee Session at Doha, Qatar (July 2014), in favour of a follow-up Reactive Monitoring Mission.

Supporting paragraphs: Zig-Zag Chair Gerrit Rietveld
Answer: Rietveld Schröder House