A former utopian healing center created by a huckster and built by derelicts.

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

One part local history, 99 parts gruesome haunted house.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A small but immensely extravagant palace built by the "Night King."

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

The final resting place for the remains of 143 Habsburg royalty.

Historic funicular railway, believed to be the shortest railroad in the world.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

The hidden jewel of Disneyland: a members only playground for the Disney elite.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.