This once-thriving coastal area is now a preserved ghost town.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Hidden in the hills of Western Pennsylvania lies one of the best-kept ghost towns in America that you can legally visit.

This unique sculpture is often overlooked by pedestrians.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

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

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

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

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

A bed and breakfast, botanical garden, art gallery, academy, and workshop all in one.

Seemingly straight out of a fairy tale, a steel chair sits on a tiny island only accessible by stepping stones.

Now home to a drinking establishment, this building has a macabre history.

An architectural marvel that dates back to the zenith of Indian architecture.

Inside this medieval church resides a unique set of murals.

These lesser-known Maltese catacombs date back over 1,700 years.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Natural time capsule containing an alien ecosystem.