As you've heard, this building is truly a palace. But inside, it hides one of its best-kept secrets: an enormous cast-iron structure. So, what is the structure you're about to see? Well, it’s not just one water tank—it’s twelve, distributed across three floors. This vertical layout allowed for greater height and water pressure throughout the system.

The structure was brought piece by piece over seven years from Belgium, and it stands as one of the most important cast-iron constructions in the world. This palace takes the idea of contrast to its fullest expression: on the outside, palatial architecture; on the inside, state-of-the-art engineering for its time.

You may be wondering—why build something so grand, with such a stark contrast between exterior and interior?

Well, you're about to discover the scale of the structure inside. But it’s also important to know that this contrast was no accident. It was intentionally requested by the Argentine government when commissioning engineer John Bateman to design the project. The message was clear: “We don’t want a simple water tank. We want a monument to the value our government places on public hygiene.”

In that sense, this building is not just a palace—it's a monument to the cultural importance of clean water in that era. In short, a monument to pure water—nothing more, nothing less.

Now, I invite you to explore this massive iron structure, which once held no less than 72 million liters of water—and today, preserves 2.5 million historic architectural documents.