Rolling sand dunes of the Sahara... in the middle of the Atlantic Ocean.

An ancient Incan convent on Lake Titicaca's Island of the Moon.

An important Mayan religious and trading center dating back to 200 BC.

In the Bahamas sits a lighthouse that is among the last of its kind.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An 18th-century battery complete with original kitchen and garrison.

What was once a unique system of urban elevators is turning into a mechanical ruin.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

This seemingly cursed monument is dedicated to one of Canada's great war heroes.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Collection of fossils, plants, and ancient animals encased in amber.

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

This vast masterpiece of Moroccan architecture spreads across 20 acres.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

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

This ancient cave temple complex is the largest and best-preserved temple complex in Sri Lanka.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This famed Silk Road oasis was one of the largest cities in the world before it was destroyed by a Mongol horde.

In Kazakhstan, a colorful cathedral with many lives once survived the most powerful earthquake in the region.

One of the most ethnically diverse spots on the planet.

Light still pours into the ruins of this ancient Islamic observatory.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

The largest known Ancient Egyptian obelisk.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.