Places Andrea IX Wants to Go

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Iranian tombstones shaped like male and female sexual organs.

Burial site of a Jewish prophet revered in Iran.

These little castles each held thousands of pigeons.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

Modern-day cave dwellers carve elaborate homes out of volcanic debris.

One of the world's largest salt caves is filled with fragile salt sculptures, salt rivers, and huge salt megadomes.

Salt cured mummies continue to turn up in this Iranian mine.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

Eccentric sculpture garden brings Basque mythology to life.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

This famous city eluded concrete detection until the early 2000's.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The tallest stationary dunes on Earth also happen to sing.

When the rain falls, this drain system turns into a musical instrument.

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

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Friction between grains of sand cause a curious "singing" sound.

Quite simply the largest tree in the world (by volume).

All that's left of the quintessential "cabin in the woods."