For me the Green Lake in Styria deserves it's name undoubtedly.  In spring, when the temperature rises and snow melts, the basin of land below the mountains fills with water. For the rest of the year the area is used as a county park.

All the roofs of the city are colored into bright honey-red, therefore the city gets covered by a magnificent light during sunsets. There are so many miradouros or viewpoints but this one stands out. You can overview the castle, the Tejo and the 25 de April Bridge while enjoying the beautiful sunset.