Wiki'd Buildings On Stamps

United states
National Capital Sesquicentennial - Supreme Court Building
August 2, 1950
Wikipedia: The Supreme Court Building is the seat of the Supreme Court of the United States and the Judicial Branch thereof. Completed in 1935, it is situated in Washington, D.C. at 1 First Street, NE, on the block immediately east of the United States Capitol. The building is under the jurisdiction of the Architect of the Capitol.

Glücksburg Castle is a "Wasserschloss" castle, i.e. almost completely surrounded by water. It is one of the most important Renaissance castles in northern Europe. It is the seat of the House of Schleswig-Holstein-Sonderburg-Glücksburg and was also used by the Danish kings. Situated on the Flensburg Fjord, the castle is now a museum owned by a foundation, and is no longer inhabited by the ducal family.

Stolzenfels Castle is a former medieval fortress castle ("Burg") turned into a palace, near Koblenz on the Rhine. Stolzenfels was a ruined 13th-century castle, gifted to the Prussian Crown prince, Frederick William in 1823. He had it rebuilt as a 19th-century palace in Gothic Revival style. Today, it is part of the UNESCO World Heritage Site Upper Middle Rhine Valley. The older stamp dates from 1932 and is a charity stamp for the needy (depression times). The photographs show the grand sitting room and the tiny Gothic chapel.

National Diet Building, Tokyo, Japan
from the "Gifts of Friendship" pane
United States
April 10, 2015
Wikipedia: The National Diet Building (Kokkai-gijido) is the building where both houses of the National Diet of Japan meet. It is located at Nagatacho 1-chome 7-1, Chiyoda, Tokyo.

The photo (with cherry blossoms in the foreground) is one that I took myself when I was in Tokyo in April 2006.

United States
Touro Synagogue
August 22, 1982
Wikipedia: The Touro Synagogue is a 1763 synagogue in Newport, Rhode Island, that is the oldest synagogue building still standing in the United States, the oldest surviving Jewish synagogue building in North America, and the only surviving synagogue building in the U.S. dating to the colonial era.

United States
Carmel Mission (Express Mail)
February 28, 2012
Wikipedia: Mission San Carlos Borromeo del río Carmelo, also known as the Carmel Mission or Mission Carmel, is a Roman Catholic mission church in Carmel-by-the-Sea, California.

United States
200th Anniversary of Nassau Hall
September 22, 1956
Wikipedia: Nassau Hall (or Old Nassau) is the oldest building at Princeton University in Princeton, Mercer County, New Jersey, United States. At the time it was built in 1756, Nassau Hall was the largest building in colonial New Jersey and the largest academic building in all the American colonies.

United States
United States Military Academy
May 26, 1937
Wikipedia: The United States Military Academy (USMA), also known as West Point,...... is a four-year coeducational federal service academy located in West Point, New York in Orange County........ It is one of the four U.S. military service academies, and one of the five U.S. service academies.

Ludwigslust Palace (Schloss) is located in Mecklenburg-Vorpommern, northern Germany. It was built as a hunting lodge, rebuilt as a luxurious retreat from the ducal capital, Schwerin, then became for a time (1765–1837) the center of government. It was the "joy" of Prince Christian Ludwig, the son of the Duke of Mecklenburg-Schwerin. The second stamp dates from times when that part of Germany was still behind the curtain. The photo shows the Golden Hall in the center of the palace.

Canada
Definitive Issue - Parliament
March 30, 1987
Wikipedia: Parliament Hill is an area of Crown land on the southern banks of the Ottawa River in downtown Ottawa, Ontario. Its Gothic revival suite of buildings is the home of the Parliament of Canada and has architectural elements of national symbolic importance.

Canada
Bonsecours Market Montreal
May 28, 1990
Wikipedia: Bonsecours Market, at 350 rue Saint-Paul in Old Montreal, is a two-story domed public market. For more than 100 years, it was the main public market in the Montreal area. It also briefly accommodated the Parliament of United Canada for one session in 1849.

Thanks to the stamp lovers of History and Geography, incl. Canada !

Ludwigsburg Residential Palace, close to Stuttgart, is one of the few Baroque buildings to have survived the tumultuous history of the last centuries almost unscathed. This truly palatial complex stands out not just for its impressive size, but also for its sumptuous interiors. Another feature is the unique blend of three quite different architectural styles: Baroque, Rococo and Neoclassicism. The stamp of 2004 commemorates 300 years since construction was begun.

Canada
Royal Architectural Institute of Canada Centenary
May 9, 2007
Wikipedia:
The National Gallery of Canada, located in the capital city of Ottawa, Ontario, is one of Canada's premier art galleries. The Gallery is now housed in a glass and granite building on Sussex Drive with a notable view of the Canadian Parliament buildings on Parliament Hill.
Ontario Science Center is a science museum in Toronto, Ontario, near the Don Valley Parkway about 11 km northeast of downtown on Don Mills Road. The Center........open to the public on September 26, 1969.

Mexico
60 years of the Torre Latinoamericana
May 31, 2016
Wikipedia: The Torre Latinoamericana (Latin-American Tower) is a skyscraper in downtown Mexico City, Mexico. Its central location, height (188 m or 597 ft; 44 stories) and history make it one of the city's most important landmarks. It is also widely recognized internationally as an engineering and architectural landmark since it was the world's first major skyscraper successfully built on highly active seismic land.