If you appreciate truly ancient, bizarrely beautiful trees, make a point of visiting the Bristlecone Pine Forest in the White Mountain range of the Eastern Sierras. These dense, tough trees can live thousands of years. The oldest recorded tree nearby is over 5,000 years old. That's one tree; 5,000+ years old. Some are only 4,000+ years old and there's plenty of middle-aged centuries-old trees as well. Our trip covered more in full, here.