The only monument to name all of the passengers and crew who died on the RMS Titanic.

A brisk climb up this solitary peak leads to the origin story of a towering figure in Irish history.

The atmospheric road was never meant to be so creepy.

Beautiful scenery provides the backdrop for an abandoned coastguard facility.

From Vikings to nationwide rebellions, this castle has seen its fair share of warfare.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Northern Ireland's Brobdingnagian stepping stones.

The lake that fills and empties itself at random.

This World War II relic let Allied pilots know they were entering neutral airspace.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

A retired military stronghold on the rolling green coast of Donegal.

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

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

An abandoned faux-pub made famous by a Guinness commercial.

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

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

The 19th-century home of Count and Countess von Hallwyl is now a museum.

Sweden's "good old days" painstakingly re-created in a model village.

A fine, large-aperture telescope available for public use.

The highest point in Washington state is a volcano covered in glaciers.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

England's most notorious suicide spot.