A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Handcrafted thermal spa washes away each night with the tide.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This strange geological landscape erupts with sudden bursts of water.

The glacier tucked within a New Zealand rainforest.

A perfect turquoise lake colored with glacier dust.

Tubing through a cave lit with glowworms is a magical underground experience.

Unusual building appears to be haphazardly built from randomly piled bricks.

Fortified homes of highland warriors that are still in use today.

The first skyscraper to include a Ferris wheel built into the facade.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

The cathedral stands in New Jufa, Isfahan's Armenian quarter that was established in 1606.

This 17th-century structure is a beautiful testimony to traditional Persian architecture

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

17th century mosque for Shah Abbas' harem.

A dreamy mausoleum honors Persia's most famous poet.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

This vast, water-filled underground labyrinth can only be toured by boat.

Modern-day cave dwellers carve elaborate homes out of volcanic debris.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

Ancient structures used to make and preserve ice in the deserts of Persia.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

The palace of the King of Kings, burned by Alexander the Great.

5,000 skulls in memorial to those killed by the Khmer Rouge.