On 6 January 1940, the German freighter Frankenwald was caught in a treacherous current on the Norwegian west coast. With a deafening noise, German steel met Norwegian rock, and ship and cargo was lost. All that's left now is a world-class wreck dive.

The Cuban government is environmentally minded. In 1996, the 837-square-mile marine area and archipelago of Gardens of the Queen located south of the main island of Cuba became a no-take reserve—the largest in the Caribbean—and in 2010 was designated a national park.

As the wheels touched down at Havana’s International airport, the plane erupted with cheers and applause. Many of the passengers on board had waited years, if not decades, to return home and visit relatives in Cuba. As part of a small group of Americans visiting for the first time, I knew immediately that we were in for a special treat.