One of the world’s longest pedestrian suspension bridges.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Perhaps the most spectacular grotto along the Algarve coastline.

One of Europe's largest groups of dolmens remains largely off the typical tourist track.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

This crumbling Portuguese ruin overlooks the populace it once ruled.

A unique seaside cave where Aleister Crowley faked his own death.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Get a privileged view over Mexico City's Historic Center from a terrace right in its heart.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

This eerie sculpture overlooks what was known as the Road of Bones under Joseph Stalin.

Ruins of a German Castle on top of a towering stone pillar.