Lying in south central Turkey, the moonscaped region of Cappadocia, southeast of Ankara, is most famous for unique geological features called fairy chimneys. The large, cone-like formations were created over time by erosion of the relatively soft volcanic ash around them. Past cultures have dug into them to create dwellings, castles (like Uchisar) and even entire underground cities like Kaymakli and Derinkuyu, used as hiding places by early Christians. Nearby Kayseri is the gateway to the area.

Potsdam was the residence of the Prussian kings and German Kaisers until 1918. It is the site of the parks and palaces of Sanssouci, the largest World Heritage Site in Germany. The city is now the capital of the German federal state of Brandenburg and a home to three public colleges and a major film production studio.

Copenhagen was once a Viking fishing settlement, and you can still find traces of the Norse explorers here. Visit reconstructed villages, the remains of a 1,000-year-old castle, and museums dedicated to the notorious raiders. Copenhagen also features a blend of modern architecture and historical artifacts such as the Round Tower observatory – a wonderful example of 17th-century architecture. Art galleries, narrow streets, canals, parks, and Baroque churches round out the city’s cultural attractions.

Amsterdam is truly a biker’s city, although pedaling along the labyrinthine streets can get a little chaotic. Stick to walking and you won’t be disappointed. The gentle canals make a perfect backdrop for exploring the Jordaan and Rembrandtplein square. Pop into the Red Light District if you must—if only so you can say you’ve been there. The Anne Frank House is one of the most moving experiences a traveller can have, and the Van Gogh Museum boasts a sensational collection of works.

The capital city of Sweden combines modern attractions with historic charm. Kick off your stay with visits to Stockholm’s two UNESCO World Heritage Sites: the Royal Palace Drottningholm (the residence of the royal family) and the magical Skogskyrkogården, or Woodland Cemetery. Stroll the cobblestone streets of Old Town and over the picturesque bridges that span the city’s canals. The 19th-century Skansen was the world’s first open-air museum and is still a premier place to learn about Swedish history.

The 1000-year-old Norwegian capital sits at the head of Oslo Fjord. This stunning setting gives hints of the wild wonders that lie just beyond the city. From taking in visual delights at Vigeland Sculpture Park, the Viking Ship Museum, the Munch Museum and Holmenkollen, to the challenging content within the new Nobel Peace Centre and the Holocaust Center, Oslo offers plenty of food for thought. The Oslo Pass allows free travel on public transport, free parking and many museum and sight admissions.

The charming Vietnamese capital has aged well, preserving the Old Quarter, monuments and colonial architecture, while making room for modern developments alongside. Hanoi may have shrugged off several former names, including Thang Long, or "ascending dragon," but it hasn't forgotten its past, as sites such as Ho Chi Minh's Mausoleum and Hoa Lo Prison attest. Lakes, parks, shady boulevards and more than 600 temples and pagodas add to the appeal of this city, which is easily explored by taxi.