One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

An oddly conical beacon perched atop beautiful Irish cliffs.

A stunning medieval castle owned and restored by the famed actor Jeremy Irons.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This single room has survived the centuries with almost no deterioration.

A monument to a 19th-century Irish woman whose murder inspired several literary works.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A hugely vast Irish landscape of barren rock that stretches for miles.

For more than two centuries, this family-run establishment has been serving up some of Ireland's best oysters.

A diminutive, thousand-year-old church believed to be the smallest in Ireland.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

France's most famous cemetery, with some of its most curious tombs.

One of Jeff Koons’s largest sculptures and his first commemorative work.

This bridge was constructed from the rubble of the infamous Bastille.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The tombstone of an unfortunate explorer who disappeared in the Paris Catacombs.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.