This ancient Irish tower could easily have stood in for Rapunzel's prison.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

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

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

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

A mysterious echo seems to defy the laws of acoustics.

Wine bottle sculpture with a ship's stateroom inside.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

A winding, cliffside stretch of road overlooking the Delaware River.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.