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

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.

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

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.

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

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

Scattered throughout London are ancient remnants of the city's former bounding wall.

Hear the quietest sound from across the dome.

One part local history, 99 parts gruesome haunted house.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Museum preserving torture methods from the past.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This trio of neolithic stone monuments are fabled to be a king and his knights that were petrified by a witch.

A petite castle folly in the English countryside.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

This elaborate towering structure was once famed for its revolutionary height.

The busy transport hub is home to the tallest airport slide in the world.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.