400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

This stone harbor was key to Carnlough's limestone industry.

The artwork is a community's ode to the "father of Irish tourism."

This giant sculpture is both loved and disliked by the local community.

This mine was once used to defend the coast from attack during World War II.

Commemorating the landing of William of Orange with his European army on their way to the Battle of the Boyne.

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

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

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

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

Handsomely crafted representations of our round planet.

This former insane asylum now holds a pathological anatomy museum.

Macabre museum devoted to historical Viennese murders.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

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

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

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

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

This desolate boat was once a key form of public transportation for Portslade residents.

These seaside shelters once enjoyed by royalty remain a part of local history.

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.