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

The castle still holds traces of the abandoned Roman fort it was built atop.

These murals stand as reminders to the troubled history of this Northern Ireland city.

Accessible only by train, the beauty of Agawa Canyon Wilderness Park is worth the journey.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

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

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

The largest earthwork effigy in the world.

The angel of death appears to weep black tears at this grave marker.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

An early 20th-century bullring converted into a modern shopping center.

A popular Icelandic children's story comes to life inside this cave.

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

This fairytale-like structure is the last turf church ever constructed in Iceland.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The oldest bookstore in Iceland.

The ruins of this former mining boomtown once housed over 3,000 people. Now, the population is two.

Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

The oldest continuously occupied public building in the United States.

A natural formation that resembles a camel resting in the New Mexico desert.