Petrified footprints of one of the very first vertebrates to walk on land.

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

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

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

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

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

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

One of Ireland's best-preserved chambered cairns can be found next to a wishing tree.

Originally commissioned as a sculpture to reflect the history of Belfast's red-light district, the final sculpture has been banned from Belfast public land.

A series of stained glass artworks that depict images of the hit TV show.

This hidden museum examines the complex history of the country's law enforcement.

This rare aquatic phenomenon is one of the more accessible tidal bores in Morecambe Bay.

The home of an eccentric Edwardian gentleman is packed to the rafters with handcrafted items collected over a lifetime.

The lantern carried by the infamous Guy Fawkes when he was arrested while attempting to blow the houses of Parliament and the King of England to smithereens

This library dates back to the late 17th century and was one of the first public lending libraries in England.

A mysterious demonic figure peers down from its perch within the gorgeous Chester Cathedral.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

These planks were originally installed to hold the dead.

In 2013, historians discovered a hidden room devoted to the art of making royals' hot chocolate.

One of Oxford's greatest treasures likely belonged to the legendary King Alfred the Great.

This restaurant's specialty is "a major enigma for food historians."

The beautiful non-repeating pattern honors the Oxford professor who discovered it.