A really great sub-range of the Cordillera Real with many interesting towers, etc.
From Wikipedia: The Cordillera Kimsa Cruz is a mountain range in the La Paz Department in Bolivia situated south east of Lake Titicaca and north of Lake Uru Uru, measuring about 35-40 km in length and 12 km at its widest point. It is the continuation of the Cordillera Real of Bolivia extending in a north to south eastern direction from Asiento pass south of Illimani to Tres Cruces pass.
Kimsa Cruz or Quimsa Cruz in hispanicized spelling is a partly Aymara (kimsa three), partly Spanish (cruz cross) expression meaning "three crosses".
The hightest elevations are Jach'a Khunu Qullu (5,800 m), Wayna Khunu Qullu (5,640 m) and Mount Gigante (5,748 m).
Hire a vehicle in La Paz, or, if your Spanish is good, take a local bus to one of the many villages (e.g., Viloco) along the range.