The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

An ancient neolithic tomb that only sees the sun twice a year.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

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

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

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.

These wooden balconies that are both decorative and functional.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

This lucky bronze frog was gifted to Madrid by a casino.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

This enormous censer uses a pulley system installed over 400 years ago.

A historic Christian shrine nestled within a spectacular natural cave.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.