An artificially-created 70,000 sqm island, which is located about 20 minutes off the coast of the Danish capital, is up for sale with immediate effect.

120 years ago, King Christian IX (8 April 1818 – 29 January 1906) turned a vision into reality and erected a citadel spanning approximately 17,000 sqm on the island.

Until 1984 the island was used by the Danish military. Ten years ago comprehensive restoration works were finally carried out shoring up the coastal protection and undertaking a project to restore and refurbish the citadel.

It has recently been run as a hotel but could easily be turned back into residential use or it could be turned into a spa and wellness centre, say agents.

‘To determine the right price for such a unique property is not easy’, says Jakob Kristensen, who manages the property on behalf of Engel & Völkers Copenhagen. ‘The fact that the island is reachable by yacht or helicopter might make it an interesting relaxation location for private individuals as well.’

Guide price: €6.8 million through Engel & Volkers Copenhagen +45 – 70 20 47 11