Not only will 2015 see the launch of a number of spectacular new cruise ships, but the opening of new routes will make some of the world's most remote places significantly more accessible.

We asked some of the travel world's top cruise experts to share their picks for the hottest cruise itineraries of 2015 and the ships that will be sailing them.

In 2015, cruise ships will be pushing deeper into the wilderness than ever before, and this particular sailing offers some great wildlife-spotting opportunities on a smaller boat.

"This Alaskan Dream Cruises sailing includes complimentary shore excursions designed to showcase true Alaskan adventures and the native heritage," says Annie Scrivanich, senior vice president of Cruise Specialists.

"Departures coincide with seasonal changes and animal migrations for the best weather and animal viewing opportunities. If you're only going to visit Alaska once, this itinerary is your best bet."

Alaskan Dream Cruises: Baranof Dream, +1 855 747 8100, from $4,399 per person

Windstar Cruises: Star Breeze

The latest addition to Windstar Cruises' fleet, Star Breeze has fans of European cruises particularly jazzed.

Among the top picks is the 10-day Sicilian Splendors cruise, which takes in Rome, Catania, Valletta, Gozo, Trapani, Sorrento and Capri.

"We're all very excited about the new Windstar Star Breeze," says Scrivanich.

"This new power yacht holds a maximum of 212 guests and provides new opportunities for those looking for a European cruise on a smaller ship."

Windstar Cruises: Star Breeze, +1 206 733 3005, from $4,449 per person

MORE: 2015: The year ahead in aviation

Viking Cruises: Viking Star

This Viking Cruises tour takes in the best of Europe's northern cities, including Bergen, Stockholm, St. Petersburg, Helsinki, Tallinn, Gdansk, Berlin, Copenhagen and Stavanger.

But it's the boat that experts are most excited about, as it will be Viking Cruises' first ocean-going ship.

The 47,800 gross tonne ship will have 464 cabins and accommodate 928 guests

"I'm really looking forward to Viking Cruises' Viking Star, which sets sail in 2015," says cruise journalist and Telegraph Travel cruise specialist Jane Archer.

"It's a brand new ship and the mockups look amazing."

Other itineraries available on the Viking Star include Mediterranean and western European tours.

(CNN)