Now you see it, now you don't. Welcome to the world's first invisible treehouse, if you can find it. Inspired by the Swedish documentary film 'The Tree Lover', the mirror house forms part of the Treehotel, a unique collection of individually designed forest retreats in Harads, just below the arctic circle in northern Sweden.

Built in 1860, this wooden lighthouse has been helping boats pass safely through the waters of Lake Vänern, the largest lake in western Europe. Still in operation, the lighthouse was renovated in 2006 and can now be rented along with a cottage and a former hen house to provide holiday accommodation for up to twelve guests.

Spend the night aboard a jumbo jet without having to fly anywhere, except to Arlanda Airport outside Stockholm where the world's first hostel to be housed in a Boeing 747 is permanently grounded. Due to open in December 2008, the aircraft has been reconstructed into a stylish yet affordable hostel for up to 85 guests.

Painted in the traditional Falu red so typical of Swedish wooden cabins, this peaceful cottage lies at the edge of a forest and close to a lake which you can explore with the canoe provided. Built in 2001, the house is surrounded on two sides by timber decking from where you can enjoy the long summer nights.

If you've ever tried searching the internet for holiday accommodation in Scandinavia then you'll know how frustrating it can be. Here to alleviate our pain is Simply Sweden. Specialising in tailor-made holidays, they have a good selection of options including these lakeside log cabins on a private estate.

Regarded as Sweden's most primitive hotel, the Kolarbyn eco-lodge is set in dense forest by the beautiful Lake Skärsjön, just two hours from Stockholm. There's no electricity in these thirteen cosy little huts but that's all part of the appeal. Families with kids seeking true adventure, and fun, will find it all here.

If there was an award for the world’s strangest hotels then Sweden would win it hands down, every year, forever! Along with the Ice Hotel and Utter Inn, here’s another wacky addition: the Långholmen Hotel – housed in the old Crown Prison, which was built in the early 19th century on an island in the middle of Stockholm.

No, this is not a hoax – at least we don’t think it is. The Utter Inn hotel is the brainchild of Mikael Genberg, a local artist and sculptor. It lies 3m below the surface of Lake Mälaren and contains only twin beds and a table. Yes, that’s right, you sleep underwater!

Each year a team of snowbuilders, architects, designers and artists from all corners of the world create the Ice hotel. In 2006, the Ice hotel consists of 80 rooms, of which they have 20 suites, 6 family rooms, 52 double rooms and 2 very special deluxe suites.