Elaborate series of tunnels where traces of mass suicide are still visible.

A sophisticated astronomical tower built by one of the greatest Persian scholars of the Islamic Golden Age.

One of the largest and oldest caravansaries in Persia.

The largest covered bazaar in the world.

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

A historic trade hub teeming with gorgeous architecture, colorful goods, and vibrant designs.

Made by river sediment, it is the largest alluvial fan in the world.

This former textile district now is now a thriving center for contemporary Chinese art.

It took an artist 20 years to create this sprawling sculpture garden honoring the area's ancient inhabitants.

China's most famous acrobatics act.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Scotland still bears an enormous scar of its Roman past.

One of the largest megalithic complexes in England, which local legend holds is a wedding party turned to stone by the Devil.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.

A unique tribute to the millions of animals who served and died for the British military.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

19th century tunnels burrowed under Liverpool.

A 550-square-meter micro-nation off the coast of Britain.

The ritual has been performed uninterrupted for nearly 700 years.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

Built to hold the worst of the worst of the Nazi war prisoners.