One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

High on a hill, an obelisk stands as tribute to local soldiers from several wars.

This castle once belonged to one of the most prominent families of medieval Carrickfergus.

A mural commemorating a man who was instrumental in the development and expansion of Belfast.

A restored World War II Churchill Mark VII Tank now stands guard in Carrickfergus.

A replica memorializes the site where women were punished after the last witchcraft trial in Ireland.

A local remembrance for lives lost—a poppy for each—in war more than 100 years ago.

This mine was once used to defend the coast from attack during World War II.

Commemorating the landing of William of Orange with his European army on their way to the Battle of the Boyne.

An abandoned shipping control tower looks like a satellite perched at the end of a pier.

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

A series of stained glass artworks that depict images of the hit TV show.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

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

A small plaque highlights the damage caused by German air raids during World War II.

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

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

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

The last Victorian market in Belfast.

A stunning 18th century pharmacy and medieval chemist's collection.

No one knows who built this strange cave of worship or exactly why.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

A medieval church built up to defend its village.

Gigantic Romanian salt mines used to heal respiratory conditions.