A hidden plaque is the only reminder of the lost palace where two storied English kings were born.

England's most famous front door has an accidental doppelganger.

Ghosts of France's colonial past.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

If they push on just the right spot, even the weakest person can move this titanic boulder.

This stone quarry was used to make axes and other tools more than 6,000 years ago.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

Weird wax anatomical models reside here, as do other anatomical specimens.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

Residential building on the Regents Canal is a breeding ground for creativity and innovation.

Hidden beneath the streets of London is a secret subway that only carried mail.

High-end antique collection housed in a centuries-old church.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Hear the quietest sound from across the dome.

The commemorative stone column conceals a secret laboratory.

Hidden in a Scotland museum is a copse of extinct tree stumps.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

A complicated contraption for telling time by the moon.

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