French collector Michel-Jack Chasseuil shows off a Porto Noval National 1931 in his wine cellar. REUTERS / Regis Duvignau Michel-Jack Chasseuil has an obsession.

For the last 50 years, he has been curating his own private sanctuary of wine — amassing over 40,000 bottles in a subterranean cave.

The collection can be found a few feet underground in western France's La Chapelle-Bâton, through a long tunnel with armoured doors. The cave is kept at a measured 80% humidity, at a temperature between 10 to 15 degrees celsius.

After visiting the collection, the Prince of Monaco called it one of the seven wonders of the world.

However, Chasseuil prefers to call it the "Louvre of Wine" — and he hopes to one day open it to the public.

Scroll down to take a rare tour of one of the largest and most beautiful private collections of fine wine in the world.