Castries, St. Lucia's capital and a busy port city, is an idyllic Caribbean wonderland. Tourists will find craft and fruit markets, photo-ready murals and a general cozy charm here. One must-do activity is getting to the top Morne Fortune (Hill of Good Luck) to drink in the lovely panoramic views. Be sure to visit the museum at Derek Walcott Square, and soak up the sun on Vigie Beach!

The Amazon River, winding through the heart of South America, is a marvel of nature that offers unparalleled adventure in one of the most biodiverse regions on Earth. Originating from the Peruvian Andes, the Amazon travels through nine countries before emptying into the Atlantic Ocean.

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.

Philadelphia, the birthplace of American democracy, offers visitors a rare opportunity to walk through the very streets where the nation’s founding ideals were debated, signed, and set into motion. The city's art scene is as bold as its history. The Philadelphia Museum of Art is home to works by Van Gogh, Duchamp, and an entire Japanese teahouse, but it might be better known for the "Rocky Steps" out front, where visitors recreate the famous movie scene daily.

Gaze in awe at the majestic beauty of Icelandic fjords in Isafjordur, a small and remote fishing village on the coast of Iceland. Once a hub for maritime activities, Isafjordur is now a cultural center and offers a variety of museums to immerse you in the culture and history of the region.