This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A Museum of Psychiatry in a still-operating mental institution.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

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