A month ago we visited Picacho Peak State Park in Arizona, arriving there in the late afternoon. That evening I took the photo below. The sun is setting behind the extreme northwest end of the Picacho Peak ridge, i.e., the end opposite the summit. Saguaro cacti dominate the landscape from near the camera to the top of the ridge half a mile away. ( The bright triangular spot in the cactus in the right foreground is sunlight passing through a very small space between the bases of two tightly spaced arms of the cactus.)
The density of saguaro cacti and their prominence in the above photo are not surprising. Typical of Southern Arizona, the tallest vegetation in the park is the saguaro cactus. Below is a photo of one I took while hiking Hunter Trail the next morning. Its height was over twenty feet.
The saguaro cactus has amazing characteristics. (See this website for details.) For example, it will not produce its first arm until it is 95-100 years old, at which time it is 15-16 feet tall. It reaches its full height, as much as 45 feet, when it is 200 years old.
The locations from which these photos were taken are shown on the map below. Zoom in for more detail.