It's just another skyscraper, but it's shaped like '90s cell phone.

A bright little alley in La Boca is a part of tango history.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

A gateway to a mysterious network of underground tunnels.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

A small but industrious mining operation that allows visitors to touch precious gems while they are still in the rock.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

A battle between nature and architecture in the Cambodian jungle.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

A museum glorifying the life of Stalin, located in the city of his birth.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Underground monastery and fortress.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

A geological oddity topped with a 2,000-year-old pagan temple.

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

Foreign invaders almost left this lovely Caucasus palace alone—almost.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A shrine of fire worship built on top of a natural flame.

The tallest stationary dunes on Earth also happen to sing.

Final palace complex of the last of 29 Kokand rulers.

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