Rovaniemi and the Arctic: The Arctic Circle runs across northern Finland, right through the town of Rovaniemi, giving it claim to being the Gateway to the Arctic. In the summer, this means tourists get to see the famous Midnight Sun. While the sun only stays above the horizon for a full 24 hours in Rovaniemi on the summer solstice in late June, from late May to early August it never drops far enough for it to get dark. Locals are out enjoying their great outdoors throughout these "White Nights" and encourage tourists to join them. Rovaniemi is in the center of a large natural area of rushing rivers for canoeing, swimming, or fishing, with trails alongside them for hiking and cycling. The city is best known (ask any Finnish child) as the home of Santa Claus, right astride the Arctic Circle at Santa Claus Village. You can meet reindeer here or visit a Sami reindeer farm.
Lemmenjoki National Park: Lemmenjoki National Park would be a wonderful place to visit. The enormous boreal forests are part of the largest park in Finland and one of the biggest chunks of wilderness in all of Europe, covering more than 2,500 square kilometers. There are hundreds of kilometers of marked trails to hike along, as well as free and open wilderness huts and more sophisticated rental huts with saunas and campfire places. The namesake of the park, the Lemmenjoki River, is absolutely stunning to behold, flowing elegantly past the towering pines. Visitors can either rent a boat or take a tour. This is the perfect place to find brown bear, wolves, and wild golden eagles, as well as moose and reindeer.
Northern Lights: For most people, seeing the Northern Lights is a once-in-a-lifetime experience. Finland is quite possibly the top country in the world for seeing these beautiful dancing lights drape across the sky. Although at times the lights can even be seen in the southernmost regions of the nation, the best place to see the Northern Lights is in the region close to or north of the Arctic Circle. Here, between September and March, visitors are almost guaranteed a show if the sky is clear. A wide range of hotels in the north cater specifically to people wanting to see the lights. Also, the Finnish Meteorological Institute allows you to sign up for free Northern Lights email alerts.
Suomenlinna Fortress: One of the world's most massive sea fortresses, the 18th-century fort on Suomenlinna is a 15-minute ferry ride from Helsinki's Market Square (a mini-cruise that has lovely views of the city as a bonus attraction). Once here, you could easily spend an entire day with its sights and activities. The enormous fortifications, now a UNESCO World Heritage Site, were built in 1847 by the Swedes (Finland was Swedish territory then). this magnificent castle was built scare off the Russians, but they weren't scared and later took over both the fort and Finland. The audio-visual experience (in the visitor center (it's in English)) is a great way to start off with some lively history, then explore it's ramparts, tunnels, and museums and walk the trails around the beautiful island. Or sign up for a guided walk to learn more about the fort, and it's various attractions, including the 250-ton Vesikko submarine, used by the Finnish Navy from 1936 until the end of World War II. The Ehrensvärd Museum illustrates the earliest Swedish period, and the Doll and Toy Museum displays dolls, dollhouses, and toys from an old Russian villa. There are various buildings that house studios, shops of glassblowers, potters, and other craftsmen, and in the summer, you can stay for evening dance and some musical performances of the Suomenlinna Summer Theatre.
Helsinki Churches: Three of the top places to visit in Helsinki are churches, two of them cathedrals and the third a landmark of modern architecture. Uspenski Orthodox Cathedral rises dramatically above the east side of the harbor, it's 13 green-topped spires ending in gold cupolas. This is western Europe's largest Orthodox church, it's interior glowing with gold, icons, crosses, altars, and beautifully decorated arches. The cathedral serves Helsinki's large Russian population, and visitors are always welcome. On the hill directly behind the harbor and an equally visible landmark to those approaching Helsinki by sea, the enormous Neoclassical Lutheran Cathedral is so close and so large that it appears to be standing on the roofs of the harbor-front buildings. The tall green dome and broad steps of the early 19th-century cathedral form the majestic focal point of Senate Square. The buildings facing the square complete a harmonious enclosure, one of Europe's most beautiful public squares. It is often used for celebrations and as the starting point of parades.
Turku: The southwestern Finnish town of Turku, the country's oldest town, and until 1812 it's capital, lies on the Gulf of Bothnia, at the mouth of the Aurajoki River. Turku lies in the area where the successors to the Swedish Vikings landed in the 12th century, and set out to conquer what is now Finland. With eight centuries of history, it is today the most traditional medieval town in Finland, but in addition to its outstanding medieval buildings, you'll find examples of Art Nouveau and modern architecture, such as the Sibelius Museum, by Woldemar Baeckman. The river is a focal point for the city, lined with historic boats, some of which have been converted into restaurants. In the summer, locals crowd it's banks in the evening and in the winter, it becomes a giant skating rink. On the northeast side of the river is the commercial center with the Kauppatori (market square) shopping center and beautiful Orthodox Church. On the opposite bank, the medieval cathedral, consecrated in 1290, rises above the Old Great Square. It is a massive brick church, in Late Romanesque style with Gothic and Renaissance additions, and a huge 319-foot-tall tower, which dominates the city. During the midsummer Medieval Festival, the old square's ensemble of historic buildings regains it's medieval air with craft stalls, and food vendors.