These islands are biological marine reserve and national park due to their vast number of endemic species. First navigation chart of these islands was made in 17th century but even more they became popular thanks to Charles Darwin and his research of these islands.  Galapagos Islands are volcanic origin and protected as National park and as UNESCO World's heritage, so to visit them you need a special permission.
If you love animals and if you are a fan of swimming and diving with sea lions, penguins and sea turtles the Galapagos archipelago is the world famous place for it. In this area you can watch a giant 400 pound tortoise trudge through the forest.  We can say, Galapagos offers unforgettable moments.