A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Venice's "Island of the Mad."

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Venice's island of the dead.

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

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

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

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

Huge standing stones mark a site of megalithic mystery.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

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

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

An ancient neolithic tomb that only sees the sun twice a year.

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

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

The 100-year-old public collection of a New Hampshire dentist that contains taxidermy, Native American artifacts, and a pair of mummy hands.

A wunderkammer hidden on the top floor of the Hartford statehouse.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

Around 100 sculptures from artists all over the world decorate the hiking trails surrounding this locale.

Taxonomy experiment known for quirky collections.

This rare symbol of Eastern philosophy in the West has been created over years of painstaking construction by the local community.

Books you don’t need in a place you can’t find.

A classic roadside attraction on Vermont's historic Route 5.