An officers prison camp believed to be impregnable by the Germans saw over 30 successful escapes.

One of the most iconic neon ads of former East Germany.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

A moody and picturesque riverside ruin overgrown with vegetation.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

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.

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

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

The last Victorian market in Belfast.

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

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

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

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

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

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

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The modern birthplace of Irish freedom.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.