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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A self built castle built by a salt worker in Brazil.

A house filled to the brim with oddities and curiosities.

An intricately decorated tiny place of worship.

A village of art and exotic creations.

Celebrating the transformation of trash into objects of beauty.

Home to the "Circus" trees created by Axel Erlandson.

A strange house built only at night, with rumored mystic inspiration.

A hand-built folk art installation covered with messages of God's love.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

The oldest operating pharmacy in the world features 800-year-old recipes.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The Magical World of George Phar Legler.

Grotto replete with mystical designs laid out in glued shell mosaics.

A museum in the childhood house of a medical pioneer.