Dolphin Research Center 58901 Overseas Highway, Marathon, FL 33050, 305-289-0002, Learn about and interact with dolphins, one of the most intelligent mammals in the world, while at this educational and research facility which is home to a family of Atlantic bottlenose dolphins, as well as California sea lions. more... 

Florida Keys Children's Museum 5550 Overseas Highway, Marathon, FL 33050, Located at Mile Marker 50, 305-743-9100, Children can discover sea creatures in touch tanks, spend time at the 15,000 gallon saltwater lagoon, try out some of the interactive display, dress up like pirates, and enjoy exploring the remains of a Bahamian village while at this children's museum that also features a mile long loop trail on site.  

Pigeon Key Old Seven Mile Bridge, Marathon, FL 33050, Located at Mile Marker 47, 305-289-0025, Venture back in time when you visit this tiny island that played a tremendous role in the Florida Keys of today and is listed on the National Register of Historic Places. Enjoy a ride through history on "Old Henry," a train that will take you past historic locations and educate you on the rich early century railroad history, while visiting the island. more...

Crane Point 5550 Overseas Highway, Marathon, FL 33050, Located at Mile Marker 50.5, 305-743-9100, See spectacular artifacts and memorabilia of ancient Native Americans, pirates, wreckers, and railroaders at this unique 63 acre site that is home to the Museum of Natural History, the Children's Museum, the Adderley Town Historic Site, and the Marathon Wild Bird Center. An extensive nature trail is also on site where you can learn about the Keys native plants and animals. more... 

Museum of Natural History of the Keys 5550 Overseas Highway, Marathon, FL 33050, Located at Mile Marker 50, 305-743-9100, A natural history center that features 20 permanent interactive, innovative, and realistic exhibits that depict the natural and cultural heritage of the 180 mile long chain known as America's Caribbean Islands. 

Marathon Wild Bird Rescue Center 5550 Oceanseas Highway, Marathon, FL 33050, Located at Mile Marker 50, 305-743-9100, This center specializes in the rescue and rehabilitation of injured and orphaned birds for eventual release back into the wild and visitors can see many species of birds from throughout the Florida Keys area while visiting this center.