5 Largest U.S. Botanical Gardens Worth Visiting

America's largest botanical gardens captivate with vast landscapes and rare plants, drawing millions of visitors yearly. Longwood Gardens in Kennett Square, Pennsylvania, spans 1,100 acres of dazzling displays, woodlands, meadows, and grand conservatories, recently named the nation's best by USA TODAY. Denver Botanic Gardens covers 23 acres focused on native plants and conservation across three unique sites with over 32,000 species.