Set at the meeting point of Brazil and Argentina, Foz do Iguaçu is defined by the sheer scale of the Iguaçu Falls. Nearly 275 individual waterfalls stretch across close to three kilometers, sending mist into the air and sound echoing through the surrounding forest. Visitors follow raised walkways that bring them face to face with this moving wall of water, culminating at the dramatic Devil’s Throat, a deep, curved drop where the river seems to vanish into the earth.

Palm Beach, located on Aruba’s northwest coast, is the island’s most famous stretch of sand: a two-mile ribbon of soft white shore lined with turquoise waters and a lively resort scene.

Argentina has everything from historical sites to casinos, warm sunny beaches to beautiful scenery. Although first-class accommodations are not available at all locations, the hospitality is one of the friendliest in the world.

Martha’s Vineyard, located just seven miles off the coast of Cape Cod, feels like a world apart. This island has long attracted artists, presidents, and vacationers seeking something quieter than the mainland. With six distinct towns, each with its own style, visitors can explore everything from the stately streets of Edgartown, once a prosperous whaling port, to the laid-back vibe of Chilmark, where stone walls and sheep pastures stretch to the sea.

One of the major rivers of the Iberian Peninsula, the Douro in north-central Spain and Portugal just might be the world's most beautiful wine region. Most of the river on the Spanish side isn't navigable, so river cruises generally travel roundtrip from Porto, on the coast of the Atlantic.