The ancient water tanks remain some of the ruined city’s most beautiful architecture.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

A 17th-century mosque that was used for war more than worship.

Massive fortress bastions in the desert of Cholistan.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

One of the most ethnically diverse spots on the planet.

Final palace complex of the last of 29 Kokand rulers.

Where the father of Persian poetry is laid to rest.

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

The Avenue of Mausolea is a series of grand palatial tombs.

A marvel of Byzantine engineering under the streets of Istanbul.

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

A symbol of Islam in oil-rich Brunei.

Four distinctly unique gardens commemorate the POWs who lost their lives during the Sandakan Death Marches of 1945.

The summer tourists on these cliffs are thousands of seabirds.

The center of the only hemisphere that awards visitors with a commemorative coin.

Huge standing stones mark a site of megalithic mystery.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

A haunting tribute to pioneering photographer Clover Adams.

A memorial to a shareholder activist feared by CEOs around the United States.

Hundreds of Buddhas in a re-discovered Indonesian temple.

A subterranean Holocaust refuge within one of the world's longest cave systems.

The heads of two giant mythological water horses honor Scotland's horselord past.