A perilous medieval road leading right into the sea.

The fantastic architectural models of a French traveler.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

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

Sleep in the hay, spin the wheel and eat grain pellets to your heart's delight.

An often-shuddersome journey into a low-tech, robotic themepark.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

360° views of the city plus five floors of optical illusions and hands-on science.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.