Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Famously misunderstood wonder of the ancient world

Home to three historic ships from the age of Vikings.

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

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

The stunning interior of this Gothic church is covered in ornate gold details.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

Few other hotels can rival the grandeur of the Castle in the Rockies.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Tower in the center of town marks the midway point in the 10,000-kilometer Cape-to-Cairo journey.

A Nesting Doll of Churches.

A fascinating insight into daily life in the Eastern Bloc.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most visited, and possibly most controversial, museum in Germany.

France's most famous cemetery, with some of its most curious tombs.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

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