Jesus' footprints and the first catacombs in the world.

One of seven Jewish catacombs in Rome and one of only two open to the public.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Architectural monsters are devouring this palace's every door and window.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

Wallabies live naturally on this Irish island.

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

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

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

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

The oldest public library in Ireland.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

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

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

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

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

A standing relief of a Norman knight whose posture marks him as a Crusader.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

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

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

An 1814 castle that hosts an exhibit of "explorabilia".

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

A corkscrew-shaped barn in Ireland.