The Basilica of Saint Nicholas (Dutch: Sint-Nicolaasbasiliek) is located in the Old Centre district of Amsterdam, Netherlands. It is the city's major Catholic church. Officially the church was called St. Nicholas inside the Walls, i.e. the oldest part of the Amsterdam defence works. The architect, Adrianus Bleijs (1842-1912) designed the church basing himself on a combination of several revival styles of which Neo-Baroque and neo-Renaissance are the most prominent models.
The facade is crowned by two towers with a rose window in between. The centre of this window is formed by a bas relief depicting Christ and the four Evangelists, made in the Van den Bossche and Crevels workshop in 1886. A sculpture of the patron saint of both the church and the city of Amsterdam was placed in a niche in the upper section of the gable top. The well-known sculptor Bart van Hove (1850-1914) made the sculpture in 1886. The crossing is articulated by a large octagonal tower with a baroque dome and lantern and crowned by a cross.
The basis of the groundplan is the scheme of the classic three-aisled cross-basilica, i.e. a nave, two aisles and a single transept. The choir is located as is usual, at the end of the nave. In the corners formed by the transept and the nave, two chapels are located, traditionally devoted to Mary and Joseph. The basilica has a collection of religious murals. Above the high altar is the crown of Maximilian I, which is a symbol seen throughout Amsterdam.