Take a ride back in time with a steam locomotive trip through Eritrea’s mountainous countryside.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

At this ancient settlement at the foot of Mount Babadağ, honeycomb tombs are carved into a round cliff.

This amazingly preserved Gold Rush town is a historian's dream.

This former mining hub holds a surprising abundance of undisturbed relics from the Old West.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest in the world.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

An architectural marvel that dates back to the zenith of Indian architecture.

On the outskirts of the small village, an abandoned grassy field glitters thanks to the white stones of an ancient structure.

An ancient fortification lives on in this Chinese city.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A witch wreaks ruinous revenge on this ancient church with her "enchanted leg."

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

Perhaps the most spectacular grotto along the Algarve coastline.

This park was designated by UNESCO as an Endangered World Heritage site.

This castle resides in a valley known for immense bloodshed during the Middle Ages.

One of ancient Etruria's most spectacular archaeological sites with impressive necropolises and rugged landscape.