While the trees have always been susceptible to disease ... But no one has found a cure. In the fall, aspen's golden foliage creates a stunning contrast with the surrounding evergreens.

Young aspens often don't survive because of factors such as grazing elk, according to a study by Northern Arizona University researchers.

This serene retreat is open year-round and each season boasts its own unique beauty, from snow-capped peaks in the winter to ...