This Communist-era residential block is one of the longest residential building in Europe.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

Museum dedicated to "the man who moved the Earth."

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

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

Belfast's namesake river still winds below the city center, hidden from sight.

This massive monument has been telling the time for 150 years—at a slight angle.

The last Victorian market in Belfast.

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

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

These barriers stand as stark reminders of Northern Ireland's troubled past.

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

A stunning Victorian abbey and walled garden on a lakefront.

Modern sundial uses ancient methods to tell time and date perfectly.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

Local legend says the remains of Father Christmas lie within the medieval grounds.

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

These imposing walls and towers look more like the ruins of a fortress than a monastery.

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

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

The home of Ireland's last leprechauns is officially protected by the European Union.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.