The Galapagos Islands
Charles Darwin came to these islands on the HMS Beagle in the 1850's. His theory of evolution was based on his discovery that the animals, birds and reptiles on each small island were unique. So it remains today--but climate change and tourism are challenging this wonderful place.
The Galapagos Islands are famous for providing Darwin the evidence he needed to finalize his theories of evolution. Today these islands are fairly well protected--certainly Ecuador could do a better job if they had more resources--and interest.
Live on a small boat--no more than 10 or 12 people--and travel from island to island with a well-experienced guide. Landings are restricted to strict schedules and the larger boats dump 30 or 40 people at a time. One can get very close to the wildlife as they have no preators and no fear. Island paths are well marked to protect the indigenous plants--and each island is unique for both flora and fauna. From volcanic rock to lush bushes between islands that are mere tens of miles apart.
Like all travel in these times, go sooner that later as the pressure and tourism are slowly destroying the world treasure.