Cuernavaca, often called the “City of Eternal Spring,” has long been a retreat for those seeking warm weather and relaxing surroundings just 90 minutes from Mexico City. With a history that stretches back to the Aztec empire, the city is layered with centuries of cultural change. The historic center of Cuernavaca combines architecture from multiple eras, with narrow streets leading to quiet plazas and colonial churches.

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.

Sunshine, cars, celebrities... these are just a few of the things that define Los Angeles. But as any visitor to this expansive Southern California city will tell you, it's a place with seemingly infinite possibilities. There's downtown, with Crypto.com Arena, Walt Disney Concert Hall, and Olvera Street. There's Hollywood, with its Walk of Fame, maps to the stars' homes and palm-tree lined boulevards. There's Santa Monica, with its pier, shopping and ocean breezes.

Plovdiv, one of the oldest continuously inhabited cities in Europe, carries over 8,000 years of history layered into its streets. The Roman Theater, still in use today, was discovered by accident in the 1970s and now hosts operas and concerts overlooking the Rhodope Mountains. Nearby, visitors can walk the remains of a Roman stadium buried beneath the main pedestrian street, where modern shops and cafés stand above ancient foundations.

Poros, a small island in the Saronic Gulf of Greece, is known for its pine-covered hills, neoclassical architecture, and laid-back charm. Just an hour by ferry from Athens, it feels worlds away from the bustle of the capital, offering a slower pace and picturesque scenery.