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

Ireland's only German military cemetery holds the remains of a spy who was moved there under the cover of darkness.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

This European portal tomb has a capstone that weighs around 150 tons.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

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

A hugely vast Irish landscape of barren rock that stretches for miles.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

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

An unusual manor of stunning beauty, born out of a crippling disease.

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

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

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

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

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

Regency-era excess on the English Coast.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Flamboyant architecture from the turn of 20th century.

These engineering masterpieces are a dominant feature of the Belfast skyline.