was the site of the Alþing, the annual parliament of Iceland from the year 930 until the last session held at Þingvellir in 1798 (wiki)

Scottish Parliament at Holyrood

Carignano Palace Italian Parliament 1861-1864

Federal Palace of Switzerland

Regensburg was the regular meeting place of the permanent Imperial Diet (1663-1806)

National Assembly of Suriname: situated in the former park house at the Independence Square in Paramaribo, after a fire destroyed the old building of representation on 1 August 1996
See en.wikipedia.org

Aragon parliament at the Aljaferia in Zaragoza.

The State House (1620) in St. George's was the first purpose-built home of the House of Assembly, which then constituted the only chamber of the Parliament of Bermuda (wiki)
See en.wikipedia.org

Madama palace (Italian Senate) and Montecitorio palace (Italian Chamber of Deputies)

The Hungarian Parliament Building is the seat of the National Assembly of Hungary
See en.wikipedia.org

The Palace of Westminster is the meeting place of the Parliament of the United Kingdom

Parliament House

Chandigarh, Palace of Assembly - Legislatures of Punjab and Haryana.
See en.wikipedia.org

Parliament building
See en.wikipedia.org

The Parliament of Curacao meets at Wilhelminaplein 4 in Punda.

The Independence Hall was the temporery seat of the Israeli parliament until the construction of the current Kneset in Jerusalem was completed.

Austrian Parliament

Grandmaster's Palace in Valletta is Malta Parliament

"The people of St Kilda, a Gaelic-speaking population, lived under their own form of democracy with an informal meeting held every weekday morning in the village street. It was known as the 'St Kilda Parliament' and consisted of all the adult males on the island."
See www.ambaile.org.uk

Consiglio Grande e Generale, Parliament of San Marino

1st Parliament of Australia 9 May 1901

Parc Montmorency: was the location of the first and second Parliament buildings of the United Province of Canada between 1852 and 1866 (wiki fr)

Valdstejn Palace (Czech Senate) and some buildings in the Lesser Town

The Congreso de los diputados meets in the Palacio de las Cortes
See en.wikipedia.org

Palais Bourbon, seat of the French National Assembly

Congress Hall, part of inscribed WHS Independence Hall was used as the United State Congress from 1790-1800

The Salone del Cinquecento at the Palazzo Vecchio served as the first parliament of unified Italy before the capital was moved to Rome

Hotel de la Chambre des Députés, Luxembourgian Parliament

Parliament of Barbados

Brasilia National Congress Building designed by Niemeyer. Houses the Senate and the Chamber of Deputies

Great Hall of the People: " It is used for legislative and ceremonial activities by the government of the People's Republic of China and the ruling Chinese Communist Party. The People's Great Hall functions as the meeting place for the full sessions of the National People's Congress, the Chinese legislature..." (wiki)

parts of the castle serve as the residence of the Mecklenburg-Vorpommern state parliament (wiki en)