Each October to January, orcas (or killer whales) journey up Tysfjord in northern Norway in pursuit of herring. On Explore's Killer Whale Weekend trip you can watch the spectacle of the whales using the ‘carousel feeding' technique, directing the fish into a closely packed bunch before stunning them with their tails. On the first day, you'll observe this from a boat, then the following day, weather permitting, you can don a drysuit and snorkel and join the whales in their own territory.

Cost: From £999 for four days/three nights including flights from London.
Website: www.explore.co.uk