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Atacama Compact Array (ACA)

The Atacama Large Millimeter/submillimeter Array (ALMA) is an astronomical interferometer of 66 radio telescopes in the Atacama Desert of northern Chile, which observe electromagnetic radiation at millimeter and submillimeter wavelengths. The array has been constructed on the 5,000 m (16,000 ft) elevation Chajnantor plateau – near the Llano de Chajnantor Observatory and the Atacama Pathfinder Experiment. This location was chosen for its high elevation and low humidity, factors which are crucial to reduce noise and decrease signal attenuation due to Earth's atmosphere.

From Wikipedia, CC BY-SA 4.0.

Website: almaobservatory.org (opens in a new tab)

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Puritama
They're commonly called 'Hot Springs', but that name couldn't be more of a misnomer. The Puritama (means 'hot water' in Kunza) is actually a warm river, that breaks loose from the stone a few meters away from the actual place. Water temperature usually is around 33ºC. It is amazingly clear and pure, and hosts a budding population of rainbow trout (don't worry, they're tiny and harmless). The "hot springs" are property of Hotel Explora, a five-star brand located in all of Chile's hot spots. The facilities are basic, yet elegant and extremely functional. If you can spare the money, you won't regret it; the landscape's stunning, and the water perfect. Ancient agricultural terraces line the canyon-sides, along with massive stone walls, and even some cacti.
The entry fee is something to watch out for: daily 15,000 pesos; M-F after 14:00 9,000 pesos (price updated April 2018)
Eat
Estrella Negra
Caracoles 363
Eat
Restaurant Tara
Calle Licancabur, Licancabur
Eat
Tierra Todo Naturale
Vegetarian restaurant. The food's excellent, as is the service. They can be a bit sluggish, though, and the whole restaurant's a non-smoking area.