These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

An eerie abandoned gentlemen's club built for British officials during the colonial era.

Hundreds of Buddhas in a re-discovered Indonesian temple.

This ornate Weser Renaissance house was also the home of an infamous witch hunter.

It houses the remains of a 17th-century version of the Titanic.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

Two 2,500-year-old Phoenician boats found on the coast of Spain, giving incredible insight into the ancient maritime traders.

This burial cave houses around 100 ancient coffins, neatly stacked to form a massive wall.

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

Smoked mummies housed in mountainside caves.

Some locals believe the fabled lost gold of General Yamashida is hiding somewhere beneath the city.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

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

Underground monastery and fortress.

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

This haunting tombstone comes complete with a heartbreaking story of love and loss.

During the Soviet era, the medieval capital of Volga Bulgaria served as a substitute for Mecca.

Thanks to this small string of islands World War II still hasn't officially ended between Russia and Japan.

Europe's highest peak is a key pillar of the Seven Summits mountaineering challenge.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.