An abandoned pasta factory in the centre of Bucharest, once home to Bulgarian revolutionaries and a hub of crime.

A two thousand year old brothel uncovered in Northern Greece.

An abandoned Byzantine fortress and notorious prison.

One of the most photographed locations in the entire city.

Locals insist that this is the actual jetty where St. Paul tied up his vessel on his overnight visit to the island.

Temple complex that once housed the famous statue of Nike.

This unusual geological formation on the coast of Samothraki has an interesting, if unlikely, story about how it was formed

An homage to the medieval rulers of Bulgaria.

A decaying, yet still functioning, work of communist architecture.

Both Catholic and Protestant graves dot this 17th-century burial ground.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

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

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

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

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

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

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

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

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.

This striking structure, with balconies jutting out like hedgehog spines, combine cutting-edge design with a playful approach to light and space.

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.