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

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

The largest offshore wind farm in the world would be even bigger if it weren't for some pesky birds.

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

One of these two land speed record-breaking vehicles went so fast it shattered the sound barrier.

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

The last Victorian market in Belfast.

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

The remnants of a strange stilted building on rails can still be seen at low tide.

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

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

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

The commemorative stone column conceals a secret laboratory.

The world's largest grapevine has produced a delicious harvest at Hampton Court Palace for almost 250 years.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

This tunnel entrance is built to resemble a grand castle but no one is quite sure why.

Half-drowned wooden stumps and stone blocks are all that remain of a Victorian landing that was destroyed by storms.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

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

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.