My Landscape Photography definitely has a manmade influence. Most of my Landscapes are of manmade structures, old Bridges, Piers, Abbey ruins and Churches.
For your true Landscapes, then an early start is essential. Up here in the Outer Hebrides Dawn today was about 04:00am and Sunrise at 05:10.
At 04:30am this morning, I could be found down at the bay setting up the medium format camera gear. Early starts is not something I find easy, but when in a location like this, a Sunrise is hard to resist.