Arriving by train, there's a tourist info centre next to the station. You can see the hanging Temple & Yungang grottoes in one day, so we took the night train there, arrived by morning, saw the 2 sites and left by train at nightfall.
The hanging temple left the biggest impression on me. You take quite the climb on stairs embedded in a mountain wall, to reach the wooden temple construction built into the mountain. From thre you have a very nice view of the valley, and can see the statues with Taoist, Buddhist and Confucianist influences. Makes you ponder on why Western religions have a hard time co-existing.