After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

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

Experience what life was like in Ireland during the Viking and medieval ages.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

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

One of Ireland's most infamous prisons for rebels including men, women and children.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

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

The final resting place of a man who claimed that he could tame even the mightiest of bears.

A quirky museum paying tribute to the history of the optical industry.

This lake-bound geographical marker sits at the point where three European countries intersect.

This quirky shop on a former farm is full of weird and wonderful oddities and antiques.

This three-story antique market and curiosity emporium claims to be "the largest singly owned antique shop in the Pacific Northwest."

A small house sits between two huge rocks, with its back to the sea.

Building owners can take out tiles for free at this repository for historic building materials.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

When this former hospital pharmacy closed in 2013 it already looked like a museum, so they turned it into one.

A hidden three-foot-wide house separates these two regal churches.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

A museum of tiny buildings in the tiny country of Andorra.

Extensive Orthodox icon collection in Andorra.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.