The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Single runway interrupted by a busy road that cuts across its middle.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

The oldest inn in England served brew to the crusaders.

Tubing through a cave lit with glowworms is a magical underground experience.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

A Maori village obliterated by an 1886 volcanic eruption.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

Handcrafted thermal spa washes away each night with the tide.

High winds can make this one scary landing.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

A narrow strip of land is home to the tallest migrating dunes in Europe.

A medieval setting reimagined into a unique art alley.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

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

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.