The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

The state's oldest continuously operating museum houses more than 5,000 Civil War artifacts.

It was once nicknamed "the most bombed hotel in Europe."

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

These barriers stand as stark reminders of Northern Ireland's troubled past.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

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

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The modern birthplace of Irish freedom.

The house where the writer spent his formative years.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

An unusual round church in London with a Templar past.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

A massive relic of the communist era of Berlin.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

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

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.