With the renovation of the Palacio de Cibeles and its re-purposing as an exhibition center and town hall, we can now not only enjoy the spectacular interiors, but also the viewpoint on the 8th floor which offers an entirely new vision of the Spanish capital. The views are panoramic, but the best part is the view of the Plaza de Cibeles with Gran Via and the Sevilla area in the background.
You can also see the other classic terraces in the area like the Círculo de Bellas Artes which is conveniently located in the same direction as the sunset.
To visit, you need to purchase a ticket ahead of time. The tickets cost 2 euros and they let people enter every half hour. If you want to see the sunset, it's best to check the schedule and get your tickets ahead of time.