Otto Wagner designed St. Leopold's Church, an impressive piece of Jugendstil architecture, during his Secessionist period of the early 20th century. It is located in the west suburbs on the grounds of the Vienna City Psychiatric Hospital. The Carrara marble clad exterior lies on top simple brick construction, and copper tiles cover the enormous dome. The interior features two beautiful stained-glass windows: one based on the theme of mercy and another a portrayal of "Dante's Paradise Lost."

The interior of this 14th century Gothic church is one of the most well preserved in Vienna. It was the site of many lavish court weddings. The Loretokapelle (Loreto Chapel) houses 54 small silver urns that preserve the hearts of the Hapsburg family. One of the most impressive works is the symbolic tomb of daughter Maria Theresia, a powerful neo-Classical sculptural piece by renowned artist Antonio Canova.

This Dominican church is a Baroque structure and features an impressive façade. The ornate interior includes Rococo detailing highlighted by a beautiful gilt organ. Fine examples of artwork are displayed on the majestic altars and in the elaborate nave. The frescoes, located in the cupola and the nave, were crafted in the 17th, 18th, and 19th centuries and are especially magnificent.

This enormous church was dedicated in gratitude to St. Charles Borromeo, patron saint of the plague, who Emperor Karl VI felt delivered Vienna from its plight. Construction started in the early 18th century and its unorthodox exterior is a collage of architectural elements derived from the ancient Greek and Roman to contemporary 18th century styling. The interior is embellished with altarpieces and carvings by prominent artists of the time.

This picturesque Catholic Church is dedicated to the Nine Choirs of the Angels. It was founded by the Carmelite friars near the end of the 14th century and now serves as a parish for the Croatian community. The Baroque façade is original and features a large balustrade balcony. An interesting high altar and magnificent frescoes highlight the interior. Tiny, quaint shops are tucked in between the buttresses of the Gothic choir at the back of the building.