Some of the most spectacular scenery is found on a trip to the San Juan Islands. No wonder. This 100-million-year-old mountain range turned archipelago, located a few miles northwest of Seattle, changes dramatically with the tide. There are 743 islands at low tide--and 428 at high tide.

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.

Oslo, Norway’s capital, stands at the crossroads of Nordic history and forward-thinking design. Originally founded over a thousand years ago by Viking King Harald Hardrada, the city has evolved from a medieval trading hub into one of Europe’s most modern capitals. Visitors can explore its layered past at the Akershus Fortress, a 13th-century stronghold still standing guard over Oslofjord, or walk through the preserved wooden homes of Damstredet.

Monastir, a coastal gem in Tunisia, offers a perfect blend of history, culture, and sun-soaked relaxation. Overlooking the azure waters of the Mediterranean Sea, the city is famous for its majestic Ribat, a well-preserved Islamic fortress dating back to 796 AD. This imposing structure, used historically to defend against Byzantine and European invaders, offers visitors panoramic views of the coastline and the city below.

Wiesbaden is located in west central Germany at the southern foot of the Taunus Mountains, on the Rhine River, near Frankfurt. It is popular for its 26 hot mineral springs and mild climate and tourism is vital to the local economy. Wiesbaden is a cultural center; places of interest are the former royal and ducal residences; the Kurhaus with its casino and its concert halls; the Colonnade, remnants of a Roman wall known as the Heidenmauer ("heathens' wall"); and the Hessian State Theater.