Imagine panoramic coastal views, 2.49 acres of space and a Grade-II listed fort ??? all on your very own private escape.It could all be yours, if you have a spare ??3 million to splash.??Thorne Island, located just off the Pembrokeshire coast in Wales, is listed for sale on Rightmove.??The lucky new owner will be treated to absolute seclusion and has the choice of either helicopter or boat for their arrival to the island, with??a private jetty, as well as five private sea moorings and a helipad.A fort sits at the heart of the site, which totals just over 8,000 square feet, making it a substantial residence, with??exposed brickwork, sash windows, a wood-burning stove and even vaulted ceilings featured throughout the property. Thorne Island is just off the Pembrokeshire coast and is on the market for ??3 million The secluded spot boasts a fort that is just over 8,000 square feet in size Inside the Grade-II listed abode are several bedrooms, as well as an open-plan living space and dining area that can seat a large number of peopleThere are five bedrooms in the fort and it has the space to sleep up to 20 guests.Three of the rooms are double and offer en-suite bathrooms, as well as views of the surrounding sea and have access to the courtyard.Another looks out onto Angle Beach and even has a wood-burning stove to keep cosy sleepers on winter nights.??The fifth bedroom is located centrally, according to the listing.Other rooms include workshops, boiler rooms, storage and five bathrooms.??There’s also a glass-fronted office space that sits on the??western cliff edge.Throughout the property there’s new flooring as well as hardwood heritage glazed sash windows.Thorne Island is registered as a Hotel & Premises (VOA Business Rates), meaning the next owner could utilise the space as a commercial venture if they wish.??Outside, the courtyard has a lawn that’s perfect for hosting parties and offers a great outdoor space.?? Thorne Island is even registered as a Hotel & Premises (VOA Business Rates) The lucky owner could even land a helicopter on the island’s very own helipad??A rooftop bar adds to the fun, and it even has a games room. Meanwhile, a large terrace area is another spot for holding gatherings.??Residents and guests can make the most of the island’s surroundings and natural landscapes.There are caves to explore, sandy beaches and great spots for fishing and water sports.The island is also completely off-grid and is powered by a range of renewable energy systems.From a 250,000 litre rain harvesting system to a??PV Solar display with 100kWh battery storage, Thorne Island is well prepared.It even has air source heat pumps that provide hot water and underfloor heating.But if Thorne Island is out of your budget, how about an island in Croatia that is cheaper than a London house.??Mali Kosma??, located in the ??ibenik Archipelago on Croatia’s Dalmatian coast, is currently listed for sale for ???700,000 (??603,377).?? There’s plenty of characterful features in the fort, from bare brickwork to vaulted ceilingsThis little slice of paradise is the smallest property currently??listed on the Croatian private island market, but the asking price is lower than a terraced house in London.According to property portal Rightmove, most homes sold in the capital over the past year were flats, with an average sale price of ??513,624, while terraced properties sold for an average ??775,447.??Situated around 250m from the mainland and around 22km west of Split Airport, Mali Kosma?? offers seclusion without complete isolation.Mali Kosma?? itself covers around 1.2 acres, and, unlike many larger islands marketed as luxury development opportunities, it remains entirely undeveloped.??It is flat and covered in dense macchia shrubland, typical Mediterranean vegetation consisting of hardy shrubs and low-growing plants.??Rocky shores surround much of the island, making access by boat a little challenging depending on the weather.??