Narrower Terms (17)

• ▶ California National Historic Trail
• Captain John Smith Chesapeake National Historic Trail
• Connecticut River National Parkway and Recreation Area
• Continental Divide National Scenic Trail
• Ice Age Floods National Geologic Trail
• Journey Through Hallowed Ground National Heritage Area
• ▶ Lewis and Clark National Historic Trail
• ▶ Mormon Pioneer National Historic Trail
• Natchez Trace National Scenic Trail
• National Heritage Areas (United States)
• Nez Perce National Historical Trail
• Ohio River Islands National Wildlife Refuge
• ▶ Oregon National Historic Trail
• Research natural areas
• Trail of Tears National Historic Trail
• Upper Mississippi River National Wildlife and Fish Refuge
• Vicksburg Campaign Trail