This Victorian water wheel is affectionately nicknamed "Little Isabella."

World's largest working waterwheel has been around for over 150 years.

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 "Black Arch" guards the entrance to the picturesque Glens of Antrim.

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

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.

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

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

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

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

Originally commissioned as a sculpture to reflect the history of Belfast's red-light district, the final sculpture has been banned from Belfast public land.

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

This ancient Irish tower could easily have stood in for Rapunzel's prison.

The place that allegedly inspired James Hilton's depiction of Shangri-La.

A place as enchanting as the journey to reach it is harrowing.

Space-age minarets towering over Islamabad.

A 17th-century mosque that was used for war more than worship.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

Tibetan-influenced mountain fortress in Northern Pakistan.

One of the holiest Shi'i shrines in Iran honors the life and death of a learned noblewoman who became a saint.

Long before air conditioning, Persian architects found an ingenious way to cool off.

This ancient fortress in Iran was once the oldest and largest treasury in the world.