Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Elevated freight railway turned wildly successful urban park.

Friction between grains of sand cause a curious "singing" sound.

Impossibly life-like natural history models created out of glass by a father and son.

Three prestigious academic collections come together to create a world-class natural history museum.

The biggest museum dedicated to insects in North America, one of the largest in the world.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

An enormous, inside-out glass globe built in 1935.

The building that inspired Shirley Jackson's "The Haunting of Hill House."

Northern Ireland's Brobdingnagian stepping stones.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.