Monumento a Los Ojos

A never-finished memorial to the heroes of the Napoleonic War has become "Scotland's Folly."

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.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

Remnants of a Victorian garden feature sitting in public woodland.

Amazing collection of folly buildings in Cobham, Surrey.