The Posada del Sol in the Colonia Doctores neighbourhood of Mexico City is one of the capital's most enigmatic haunted locations — an ambitious hotel project from the 1950s that was never completed due to what many consider supernatural interference. The building's developer, a wealthy Mexican businessman, envisioned a grand Art Deco hotel, but construction was plagued by accidents, financial misfortune, and the unexplained deaths of workers. The project was abandoned, and the partially completed building has stood empty for decades. Those who have entered the ruin describe hearing music and conversation as though a grand party is underway, seeing lights in the ballroom, and encountering a well-dressed man who identifies himself as the owner and invites visitors to stay. The building's ornate but decaying interior — with its art deco detailing visible beneath layers of grime and graffiti — suggests what might have been. Some accounts describe the smell of cooking food and fresh flowers in the ruin, and others describe a time-slip effect where the building briefly appears as it was intended to be. The Posada del Sol has become one of Mexico City's most iconic abandoned buildings and a symbol of ambitions that were thwarted by forces beyond the material world.