The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

A city entirely devoted to illegal gun production.

Tibetan-influenced mountain fortress in Northern Pakistan.

Space-age minarets towering over Islamabad.

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

A mere stone's throw from Islamabad exists a spectacular display of three millennia of humanity's progress.

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

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

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

The world's second-largest sundial, made entirely out of stone.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

A brick building in Kathmandu's Durbar Square is home to Nepal's most prominent living goddess.

This representation of Lord Vishnu is the largest stone sculpture in Nepal.

Dating back to the fourth century, it's the oldest Hindu temple still in use in the Kathmandu Valley.

The oldest Hindu temple complex in Nepal serves as the seat of Nepal’s national deity, Lord Pashupatinath.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

Towering at a height of over 30 meters, this turn-of-the-18th-century landmark is the tallest temple in Nepal.

The former stronghold of the Malla Dynasty has remained virtually unchanged since the 17th century.

This historic square in Nepal is home to temples dating back to the third century.

A Himalayan monastery claims to have a piece of a centuries-old abominable snowman.