Between 1890 and 1893, he worked, together with his brother Silvestre de Palacio (engineer), on his most important project, the transporter bridge ("Puente Colgante") on the Nervion river, between Portugalete and Getxo (Biscay), for which he gained international recognition. It was the first bridge of this kind ever built.
- Participated in the construction of the Palace of Velázquez in the Retiro Park, together with architect Ricardo Velázquez Bosco, coordinator of the project, and the ceramicist Daniel Zuloaga (1881 and 1883).
- Participated in the construction of the Crystal Palace (inspired by the London one) in the same park, again with architect Ricardo Velázquez Bosco, coordinator of the project, and ceramicist Daniel Zuloaga (1887).
- Designed and built the new Madrid Atocha railway station, in collaboration with the engineer Saint-James (1889-1892).
- Built the Osram factory (1914–1916).
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