Southeast Spain's seaport of Cartagena is a large naval base on the Mediterranean coast. The city was founded in 220 B.C. and boasts Roman ruins, mosaics and murals.

Ao Nang is a coastal town in Thailand’s Krabi province, set against a backdrop of limestone cliffs that rise abruptly from the shoreline. Once a quiet fishing village, it has grown into a lively seaside hub while still retaining strong ties to the surrounding landscape.

Yala National Park sprawls across Sri Lanka’s southeast, where dry plains meet lagoons and the Indian Ocean’s shoreline. It is one of the country’s oldest protected areas, first set aside as a wildlife reserve in 1900 and later declared a national park in 1938, and today invites travelers to see life thrive in a wide range of landscapes, from scrubland to sandy beaches.

Katakolon, also known as Katakolo, is a charmingly small port and fishing town on the coast of Greece. A primary entryway to the nearby ancient ruins of Archaia Olympia, Katakolon is a popular stop on many Mediterranean cruises. Before heading to Olympia, be sure to unwind on the warm Grecian sands of Paralia Katakolo or savor a bite of fresh seafood at one of Katakolon’s quaint cafés.

The Great Barrier Reef stretches along Australia’s northeast coast, forming the largest coral reef system on Earth and one of the planet’s most complex living ecosystems.