This "floating railway" is one of the world's oldest monorail systems.

This futuristic German television spire is actually the world's largest digital clock.

Twisted buildings adorn the banks of the Rhine river.

An electrical pylon under whose legs a normal gauge train can run.

The largest mosque in Germany.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

This remarkable prehistoric town is full of watchtowers and houses that have withstood thousands of years.

These Stolpersteine located in Spain honor Republican soldiers who perished at the hands of Nazis after the fall of France.

The first archaeological site discovered by aerial photography.

Famously misunderstood wonder of the ancient world

Ancient human remains unearthed around the iconic monument.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

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

The house where the writer spent his formative years.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

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