The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This landmark cemetery in Boston was created more than 300 years ago.

Macabre astrological automaton clock dating to the late 1400s.

This historic electric train has operated with regularity since the early 1900s.

There has been an astronomical clock on this spot since the 14th century.

Renaissance villa and gardens complete with a tormented colossus.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The naturally mummified body of a peasant girl saint.

Fortified medieval tower house with lovely roof garden.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The most loyal of little dogs, or a Victorian era publicity stunt?

Formerly abandoned underground complex to keep royals safe from a nuclear war that never came.

The fountain marks the area where hundreds of accused witches were burned at the stake.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One of Ireland's most infamous prisons for rebels including men, women and children.

The ancient tomb acts as a calendar that keeps perfect time.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.