The only churches that are designated UNESCO World Heritage List sites are works of Antoni Gaudí:[1] Sagrada Família basilica in Barcelona (1882–) that is still under construction and Church of Colònia Güell in Santa Coloma de Cervelló, province of Barcelona, that Gaudí along with Francesc Berenguer i Mestres and Joan Rubió left unfinished in 1914.
Sagrada Família is not pure Art Nouveau: its construction started before the movement incepted with a Neo-Gothic design by Francisco de Paula del Villar, of which only the crypt was built.
Another Art Nouveau religious building in Paris is Agoudas Hakehilos Synagogue (1913-1914) by Hector Guimard, who was not only the architect, but also created furnishings (luminaires, chandeliers, brackets, and benches), as well as the stylized vegetal decorations and the cast iron railings.
An Art Nouveau artist Eugène Grasset designed mosaics and stained glass windows (done by Félix Gaudin) for Saint-Étienne church [fr] (1890-1895) in Briare, Centre-Val de Loire.
[10] Jugendstil elements of Tabor Church in Rahnsdorf, Berlin Albert Klingner are an altarpiece depicting the Transfiguration of Jesus (1911) and a tableau of the Four Evangelists John, Luke, Mark, and Matthew accompanied by scenes from the Old Testament.
[13] Leopold Forstner also created stained glass windows for St. Charles Borromeo Cemetery Church (1911-1913), also in Vienna, built to designs by the architect Max Hegele.
Notable Art Nouveau frescoes can be found in Peter and Paul Basilica in Prague, made by František Urban and his wife Marie Urbanová-Zahradnická.
Famous Czech painter Alphonse Mucha created stained glass windows for St. Vitus Cathedral in Prague.
Lechner's disciples Marcell Komor [hu] and Dezső Jakab were commissioned to build the Synagogue in Szabadka (now Subotica, Serbia) in 1901–1903.
The cathedral is famous for its frescoes, painted by the symbolist Hugo Simberg, featuring versions of The Wounded Angel and The Garden of Death.
One of the most notable is Marfo-Mariinsky Convent in Moscow, katholikon of which was commissioned by Grand Duchess Elizabeth Feodorovna (born near Darmstadt that was the center of Jugendstil at the time) and built by Alexey Shchusev in 1908-1912.
As Saint Petersburg was situated close to the border with Grand Duchy of Finland, there was a strong influence of its National Romantic style on local Art Nouveau Architecture, to temples as well.
[24] A notable mix of the Prairie School and Art Nouveau styles is the Church of St. Bernard (1905–1914) by John Jager in Saint Paul, Minnesota.