Roads, bridges, and even hallways are great for showing linear perspective as they have lines that become narrow towards the far end, potentially leading the eyes to where your main subjects (like buildings, the sky, or even a person standing by the door) may be.
As you practice this photography composition technique, you’ll find that shapes are all around you as well. You’ll often find conventional, clearly defined shapes in houses (windows and doors) and other architectural structures, but you can also find compound shapes—especially if you look hard enough—in every multidimensional scene.
Triangles and diamonds tend to add aesthetic appeal to your shots. Don’t hesitate to move around and change the angle of your frame to find—and reveal—those interesting shapes.