Aurora Borealis – or northern light – happen when energetically charged particles collide with atoms in high altitude atmospheres, and this solar wind is directed into the atmosphere by the Earth’s magnetic field.

It took about 3 hours to cross a raging river using zip-lines between huge trees.

The Kungsträdgården subway station looks like an archaeological excavation, with the remains of the old Stockholm Makalös palace.

Star Trek the Experience at the Las Vegas Hilton was a living testament to the Star Trek franchise