A particularly disconcerting tribute to Irish martyrs.

The modern birthplace of Irish freedom.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

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

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

It was once nicknamed "the most bombed hotel in Europe."

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.

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

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

The last Victorian market in Belfast.

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

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

A museum marks and documents the site of the Titanic's launch.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

This trail was once used to smuggle cigarettes, sugar, and other black market goods between Italy and Switzerland.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

The only Shinto shrine in Europe that has been officially sanctioned by Japan.

The world's longest and deepest train tunnel.