As someone who travels alone across the country, I have a unique perspective on the best national parks to visit alone.
Mount Rainier (Washington)
Mammoth Cave (Kentucky)
Theodore Roosevelt (North Dakota)
Dry Tortugas (Florida)
Glacier National Park (Montana)
Gateway Arch (Missouri)
Channel Islands (California)
Petrified Forest (Arizona)
Petrified Forest National Park is home to large deposits of petrified wood, which is essentially a fossilization process where trees partially turn to stone or minerals.