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

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

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

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The oldest operating pharmacy in the world features 800-year-old recipes.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

New Hampshire's first neighborhood is now preserved as a historic village with live action role players.

This small museum is an eccentric shrine to boyhood in the 1960s.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

The last standing piece of a famous Honolulu landmark.

A controversial memorial at the place where Captain Cook met his violent end.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This black shoreline is made up of exploded lava particles.

Northern Ireland's Brobdingnagian stepping stones.

Being surrounded by typical buildings just makes this uniquely modernist house stand out even more.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

A desert in southeast Asia, complete with a beautiful lake covered in lotus flowers.

A battle between nature and architecture in the Cambodian jungle.