To fit bodies into this Renaissance crypt, they were first left to decompose in the crypt's rotting room.

A huge cathedral single-handedly constructed by one eccentric monk.

Not far from Madrid, a set of perfectly preserved trenches date back to the Spanish Civil War.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

An 18th-century estate owner thought these cottages were an eyesore, so he artfully disguised them as a church.

A mysterious ruin shrouded in more folklore than fact.

This tallest folly in the world began its life as an elaborate factory chimney.

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.