The granite head appears to be deep in thought and half buried in the ground.

This natural wonder is disappearing at an alarming rate.

Few other hotels can rival the grandeur of the Castle in the Rockies.

This expansive bridge in the Canadian wilderness was originally just built for friends.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Hear the quietest sound from across the dome.

An unusual round church in London with a Templar past.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

The ancient latrines of the Greeks, in all their public glory.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Ancient serpentine sacrifice holder that has stood the test of time.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

Vast stretch of tide-pools with a unique Moroccan charm.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.