The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

A Wild West jailhouse that slid down the mountainside.

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

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

A unique bridge with an equally unique view.

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

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

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

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

Northern Ireland's Brobdingnagian stepping stones.

A stunning Victorian abbey and walled garden on a lakefront.

The modern birthplace of Irish freedom.

One of Ireland's most infamous prisons for rebels including men, women and children.

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The site of Paul Revere's historic two lantern warning.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.