The largest trees on Earth
The great Sequoia groves of the Sequoia and Kings Canyon National Parks contain the worlds largest (by volume) trees. It's hard to get a sense of the scale by looking at the tree. It needs a person, or better yet a car or a 13 story building, to give you a sense of scale.
The Sequoia National Park contains the highest mountain in the mainland US, Mt. Whitney at over 14,500ft or 4,400m (keep that in mind for the upcoming Machu Picchu post). We couldn't see it because it is surrounded and hidden by closer mountains in the chain from the parks vantage point, Moro Rock, which overlooks the valley and the fun-to-drive switchbacks of Generals Highway.