The world's first combination ski slope and power plant.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

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

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

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

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

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

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

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

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

The location of this historic castle was inspired by a donkey.

The colorful stairs are made with marble from the world's major quarries.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

The oldest working mechanical clock in the world.

Ancient human remains unearthed around the iconic monument.

Famously misunderstood wonder of the ancient world

This ancient Egyptian obelisk still bears the wounds of World War I.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.