1.Olbrich.org
Rank:2,726,747
Worth:$110
Award-winning Olbrich Botanical Gardens --16 acres of outdoor display gardens and the indoor, tropical Bolz Conservatory. Prairie-style Rose Garden and the only Thai Pavilion and Garden in the continental U.S. Special events, concerts, garden-related classes for adults and kids, gift shop, gardening library, and meeting rooms.