The ruins of a sixth-century monastery sit on the banks of the River Shannon.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

This blowhole is supposedly caused by a trapped monster.

This legendary urban waterfall creates a dazzling display of rainbows.

Race through the maze, get your name on the sign.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

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.

A retired military stronghold on the rolling green coast of Donegal.

Experience what life was like in Ireland during the Viking and medieval ages.

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

It was once nicknamed "the most bombed hotel in Europe."

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

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

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

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

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Ice cream stand, snack bar, and time capsule of milk conveyance.

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