A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

This ancient Irish landscape boasts hundreds of legendary ruins.

Wander among the abandoned ruins of this once-powerful medieval town.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

Obelisks and stone pineapples in the Irish countryside.

Local legend says the remains of Father Christmas lie within the medieval grounds.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

One of Ireland's most infamous prisons for rebels including men, women and children.

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