Which earlier sacred buildings inspired the design of the Karlskirche?

In designing the Karlskirche, architect Johann Bernhard Fischer von Erlach sought to harmonize the most significant sacred buildings from history into a single, unified structure.1

The design incorporates elements from several influential architectural precedents:

• Temple of Jerusalem: The church’s prominent pair of freestanding triumphal columns, which feature spiral reliefs, were inspired by reconstructions of the Temple of Solomon.123
• Pantheon: The central portico was modeled after the facade of this Roman temple.1
• St. Peter’s Basilica: The church’s open pavilions recall the termination of Bernini’s colonnade in front of St. Peter’s.23
• Hagia Sophia: This historic structure in Istanbul served as a key inspiration for the building's conception.1
• Other Influences: Fischer von Erlach also drew from the Dôme des Invalides in Paris and St. Paul’s Cathedral in London, as well as the style of Trajan’s Column in Rome.123