In Norway, people celebrate the summer solstice with this enormous bonfire festival

June 21st -- the summer solstice and the longest day of the year -- marks the official start of summer. In Norway, people usher in summer with a massive celebration called Slinningsbålet. It's celebrated with a huge bonfire every year on June 24th in the town of Alesund, which sits on the west coast of the country. Slinningsbålet is part of the midsummer -- or sankthans -- celebrations, which honor the birth of John the Baptist. Since this time of year marks when the sun starts to retreat, the...