Trebinje, the southernmost city in Bosnia and Herzegovina, sits just a short drive from the Adriatic coast but offers a completely different rhythm. Framed by hills and set along the Trebišnjica River, the city has a history stretching back to Roman times. The river that winds through the city is one of the longest sinking rivers in the world and often disappears underground and resurfaces in various places.

Riyadh blends stories from centuries with modern splendor. At its core stands Al Masmak Fortress, built of clay and mud-brick in the 19th century. It was the site that set the stage for the unification of Saudi Arabia. Today, it’s a museum that preserves weapons, historical displays, and accounts of that pivotal moment. Adjacent to the fortress, the Souq Al-Zal offers spices, traditional jewelry, and handmade crafts, connecting visitors to the city’s past through its alleyways.

Delphi is an iconic historical site and was once the sacred precinct of classical Greece, due to its role in Greek myth as the seat of a prophetic oracle.

Montenegro, set along the Adriatic Sea, draws travelers with its dramatic landscapes and layered history. The Bay of Kotor, often mistaken for a fjord, is actually a submerged river canyon surrounded by steep cliffs and medieval towns. Kotor itself, a UNESCO World Heritage site, is enclosed by ancient fortifications that visitors can climb for panoramic views stretching from terracotta rooftops to the sea.

As a city located in a Baltic Sea archipelago, it's not surprising that Stockholm has 50 bridges and sightseeing boats moving people between its 14 islands. This contemporary and welcoming capital of Sweden is nonetheless easily navigable by foot. Every district here has a distinct flavor, from the sophisticated Östermalm to the bustling downtown energy of Norrmalm to the delightful Old Town.