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Heiligenkreuz Abbey (Stift Heiligenkreuz) is a Cistercian monastery in the village of Heiligenkreuz in the southern part of the Vienna Woods. Founded in 1133, it is the oldest continuously occupied Cistercian monastery in the world. With more than 270,000 volumes, the monastery library is the largest private library in Austria. At the heart of the library is the medieval collection of 1250 manuscripts and 860 incunabula. Today, the monastery library is an institution of knowledge and a partner of various regional and even international research centres.

The Heiligkreuz church was built in 1804 and restored in 1976. The tower stands at the head of the choir and has flat arched windows and an octagonal transition to the onion dome. The gabled façade has a scrolled gable above a continuous main cornice. The three-bay nave is followed by a slightly indented basket-arched choir. Ludwig Sturm painted the vault in 1936.

Heim church was completed in 1884 by architect A. H. Thoresen. A digital church organ with 34 voices was purchased in 1991.

The Heimaey stave church is a wooden church located in Heimaey, Westman Islands. The church was made in 2000, as a gift from Norway to Iceland, on the occasion of the millennium of the first church built in Iceland by Olav Tryggvason in the year 1000.

Heimdal church was built in masonry in 1960. The architect of the church is H.Semmelmann.

The monastery of Heisterbach was a Cistercian abbey founded in 1189. With the secularization of 1803, Heisterbach Abbey was abolished. Partially sold and demolished, it was not until 1818 that it was decided to preserve the remaining ruins, those of the choir. Count Wilhelm Ernst zur Lippe-Biesterfeld acquired the site in 1820 and had an English landscape garden laid out on the site. In 1840, the count had a mausoleum built on the model of a neo-Gothic chapel. Apart from this, only a barn and the brewery house have been preserved from the former monastery.

Hejde Church is one of the 92 medieval churches on the island of Gotland.

Hejdeby Church is one of 92 medieval churches on the island of Gotland.

Hejnum Church is one of the 92 medieval churches on the island of Gotland.

The present Holy Trinity Church is probably the third on this site. The oldest part of the church is the sacristy, which was built at the end of the 13th century against an earlier wooden church. In the 14th century, the present three-aisled basilica was built of stone in the lower parts and brick in the upper parts. In the late Middle Ages, perhaps in the 15th century, the sturdy but low church tower was added. The high medieval spire was destroyed in the town fire of 1702 and was later replaced by a hood. The north and south transepts date from the 15th century.