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

These sculptures honor the knights who once called Carrickfergus Castle their stronghold.

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."

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

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

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

This stained-glass window in an English church bears the coat of arms of George Washington's family.

One of the tallest mill chimneys in Lancashire gave up its ornate cast iron "crown" during World War II to assist the war effort.

This ambitious 18th century project never achieved its aim as a means of navigation but remains an essential component of agriculture and water supply in central Spain

Salaguti's live-in museum: a fortress against criticism and consumer art.

Turning night into day in Victorian-era Austin to thwart a serial killer.

Graham Ibbesons's moving tribute to the victims of England's worst mining disaster.

The ritual has been performed uninterrupted for nearly 700 years.

The second smallest castle keep in England.

This historic former textile mill now houses a brewery, hotel, and what's believed to be the longest bar in the United Kingdom.

The last two abbots of this monastery were both executed by Henry VIII.

The grounds of this Catholic boarding school are said to have inspired Arthur Conan Doyle and J.R.R. Tolkien.

Oliver Cromwell marched his army over this narrow bridge to victory at the Battle of Preston in 1648.

A stunning Victorian abbey and walled garden on a lakefront.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

A remarkable feat of Victorian engineering across the Firth of Forth.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.