ABERDEEN -- Scotland's third-largest city (pop. 187,000) is characterized by buildings of beautiful white granite. Set beside the North Sea, Aberdeen is both a university town and the capital of the Scottish oil boom. It is also one of Scotland's largest seaside resorts (though its appeal is confined to those who like their water well-chilled).

This city in the Rhine Gorge is known for its winemaking, dramatic landscapes and 15-minute cable car ride to the Niederwald Monument (celebrating the German victory over France in 1871).

Juneau's majestic sprawl and abundance of nature set it apart from most capital cities in America. Tourists arrive via air or water, many coming in on cruise ships.

Blackpool, located on England’s northwest coast, has long been a beloved seaside destination, famed for its vibrant entertainment and historic attractions. The city’s iconic Blackpool Tower, standing at 518 feet, offers panoramic views of the Irish Sea and the surrounding landscape from its SkyWalk glass viewing platform. Built in 1894, the tower houses the famous Blackpool Tower Ballroom, where visitors can step back in time and waltz under its glittering chandeliers.

Ol Doinyo Lengai, often called the "Mountain of God," is an active volcano located in northern Tanzania and is a must-visit for adventurous travelers. Towering over the Great Rift Valley, this majestic peak is unique due to its lava composition. Unlike most volcanoes that produce molten lava, Ol Doinyo Lengai emits natrocarbonatite lava, which is unusually cool and flows like water. This rare phenomenon makes it one of the most intriguing volcanic landscapes on Earth.