17. The Mendenhall Glacier Ice Caves, Alaska
These ice caves are situated more than 12 miles out of the state capital Juneau. Carved deep through the12-mile massive Mendenhall Glacier, these cool blue, ethereal ice caves are difficult to reach. Hikers must cross an ice field and scramble over slippery rocks too.
18. Redwoods, California
The imposing redwoods can be found in the Redwood National and State Parks. The famous General Sherman in the Giant Forest in popular Sequoia National Park is over 2,000 years old. Another impressive tree is the 600-year-old Hyperion. It’s the planet’s tallest living tree and stands over 380 feet tall.
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