First, go to the visitors center to buy your ticket. On Sundays the church may be closed for worship for 1 hour, but during this time you can visit the other buildings of Colònia Güell. The Crypt of Colònia Güell was designed by Antoni Gaudí as part of a larger, unfinished church for the workers of Colònia Güell, a textile colony established in the late 19th century by industrialist Eusebi Güell. Construction took place between 1908 and 1915, but only the lower section—the crypt—was completed after work halted due to financial constraints following Güell’s death. The crypt is notable for its innovative architectural solutions, serving as a testing ground for the structural solutions Gaudí later used in the Sagrada Família. The structure incorporates catenary arches, hyperbolic paraboloids, and twisted columns, achieving a balance between organic form and structural efficiency. Gaudí also experimented with diverse materials, including basalt, brick, stone, and mosaics, blending them harmoniously with the surrounding natural landscape. The interior features tilted columns that distribute weight efficiently, allowing for large open spaces. The stained glass windows, in irregular shapes, diffuse light dynamically. The integration of architecture and nature—seen in elements like the irregularly shaped floor plan and the use of earthy materials—exemplifies Gaudí’s organic approach to design.

A must see for urbex lovers ! You can easily get there by public transport, as it is right next to the "Colònia Güell" stop. When I went there (Feb 2022) I could easily access it from the left side, where a piece of wall is broken and allows easy access. There is no sign saying you can't go in, no cameras, but you can tell from the barricades that you're not supposed to go in. The inside is magnificent: be careful though, there are some places that could collapse, and some holes where you could slip. A lot of graffiti which for me is part of the urbex decor. Nobody around when I went there. A nice discovery for ruin lovers.