Five miles of underground river link lake to ocean.

This eerie abandoned building with a dark history is said to be one of the most haunted places in the Philippines.

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

A cemetery and the town it served sinks beneath the sea during the volcanic birth of Mt. Vulcan.

Hidden deep within a Filipino jungle is an incredible waterfall that plunges into a dazzling blue-green pool.

The once-grand remains of this resort are slowly turning into the strange ruins of the future.

A once great mansion stands in stately ruin.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

Bohol's mysterious brown hills.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

This lost city belongs to one of the earliest civilizations in the world.

This dazzlingly turquoise mountain lake was created in the wake of a natural disaster.

At an altitude of 3,700 meters, this is the highest polo field in the world.

This commanding mausoleum holds the remains of Muhammad Ali Jinnah, the founder of Pakistan.

Tibetan-influenced mountain fortress in Northern Pakistan.

Space-age minarets towering over Islamabad.

A tower built by an emperor for an antelope.

One of the last surviving ancient Buddhist sites in the region, it escaped the brunt of several Hun invasions thanks to its remote location.

Massive fortress bastions in the desert of Cholistan.

Lunar landscape, a mud volcano and bizarre rock formations.

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

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

This grand Pakistani mausoleum can only be accessed via an almost 1,000 foot long alleyway.