This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A gallery of underwater art that can be visited by man and fish alike.

An intricate and amazing house built by architect Karl Junker.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Buddha and Jesus tower over this French mountainside headquarters of the Aumism religious cult.

The internet as provided by a James Bond villain.

Ruins of the Crusaders' headquarters.

The most disputed archipelago in the world.

Micro-nation based around a nine-story high illegally built tower.

Surreal riveted sea forts once protected the Kent shores from German attack.

A 550-square-meter micro-nation off the coast of Britain.