The ancient tomb acts as a calendar that keeps perfect time.

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

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

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

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

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

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

A Hungarian optometrist's charming collection of Asian art and curiosities.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

"Medieval" castle built in the mid-20th century by one family.

300 years of pharmaceutical history on display.

Hundreds of boat-shaped headstones fill this graveyard as part of a centuries-old custom with mysterious origins.

The massive white mound and accompanying water terraces are a striking geological oddity.

A forgotten graveyard lost in the tangles of an overgrown garden.

Beautiful antiques and obscure engineering artifacts trace the evolution of phones from rare luxuries to ubiquitous.

The remains of an entire Roman city can be explored in this interactive museum.

An industrial site turned into Hungary's most cherished natural wonder.

A collection of intricate sculptures so small they have to be seen through a microscope.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

Hungarian self-built castle.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

This hidden art nouveau gem was designed by an architect in search of a national style.

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