Adiyaman makes a good base from which to visit Nemrut Dagi National Park. On the summit of Nemrut Daagi (Mount Nemrut), at an altitude of 2,150 meters- the highest mountain in northern mesopotamia - sits the gigantic funerary sunctuary erected in the first century B.C. by King Antiochos I of Commagene. The engineering involved in creating the artificial tumulus- flanked by terraces on which rest the colossal statues of Apollo, Zeus, Heracles, Tyche and Antiochus - continue to amaze visitors.

Caminha sits at Portugal’s northern edge, where the Minho River meets the Atlantic and marks the border with Spain. Its history is closely tied to defense and trade, visible in remnants of medieval walls and a compact historic center that once guarded the river mouth.

Scoresby Sund (Kangertittivaq in Greenlandic), on the eastern coast of Greenland, is the largest and longest fjord system in the world. On the northern side of the fjord's mouth sits Ittoqqortoormiit, the only permanent settlement in the region and home to less than 500 residents. The region is well-known for its Arctic flora and fauna.

Key Largo, the northernmost of the Florida Keys, is renowned for its pristine natural beauty and vibrant marine life. As part of the Florida Keys archipelago, Key Largo is a gateway to the spectacular underwater world of the John Pennekamp Coral Reef State Park, the first underwater park in the U.S. Here, visitors can explore vibrant coral reefs through snorkeling and scuba diving, or take a glass-bottom boat tour to marvel at the colorful marine ecosystems without getting wet.

Gamboa, Panama, was originally built to house employees of the Panama canal. The small town's main attractions are its proximity to significant tracts of relatively undisturbed rainforest, and Pipeline Road, considered one of the best bird watching sites in Central America.