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

This man-made mound monument was built out of soil from all across the Polish empire.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

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

Huge standing stones mark a site of megalithic mystery.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

This single room has survived the centuries with almost no deterioration.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

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

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

A moody and picturesque riverside ruin overgrown with vegetation.

The oldest public library in Ireland.

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

An unusual manor of stunning beauty, born out of a crippling disease.

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

A remarkably intact castle that once was the largest in Ireland.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Obelisks and stone pineapples in the Irish countryside.

Local legend says the remains of Father Christmas lie within the medieval grounds.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.