Oldest Museum of the Netherlands is a true cabinet of curiosities.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

The "little Sistine Chapel of Luxembourg" is in the smallest village in the tiny country.

Luxembourg's first beer museum honors the Grand Duchy's contributions to the art and science of beer-production.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

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

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

The ruins of a medieval monastery named after a type of tree.

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

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

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

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Remnants from a time before electricity.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

The lion represents a fascinating part of English history, and the story of a man who obsessed over its creation.

Human-made caves excavated to hide a secret society of wealthy pagans.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

This tangled English forest looks like something right out of a fairytale.