A restaurant and observation deck built in a unique broadcasting antenna.

Started as a kitchen garden, now the second largest botanical garden in the world.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This building has survived for more than a century and remains virtually untouched.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The history and future of cannabis.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This disused boat elevator was saved from the scrap heap so that visitors could tour its rusting skeleton.

The tomb of a hard traveling saint is constantly covered in shoes as offerings to heal disabled youth.

The modern birthplace of Irish freedom.

The house where the writer spent his formative years.

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

Hear the quietest sound from across the dome.

An unusual round church in London with a Templar past.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

One of Europe's largest supercomputers is housed inside of a disused chapel.

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

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

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