Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A bronze tribute to the wildly popular video game from the '90s.

Follow the original medieval paths that wind through this intriguing section of the city.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

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

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

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

The last Victorian market in Belfast.

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.

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

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

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

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

Cozy basement bar sports an inventory of over 2,000 beers.

Climb inside an iron crystal magnified 165 billion times its normal size.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.