Wander among the abandoned ruins of this once-powerful medieval town.

One of the oldest lighthouses in the world, this structure was built more than 800 years ago.

This rare and ancient Christian relic is one of Ireland’s oldest freestanding stone crosses.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

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

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

This 13th century castle is chock full of ghosts and impossibly rare cows.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

This tidal island, a sacred site in early English Christianity, was the target of a notable Viking invasion.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

An ancient burial ground believed to have been used for ritual sacrifice.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

An unusual artwork dedicated to a unique man that entertained people visiting Cambridge while raising money for charity.

One of several Lilliputian portals that are ready to transport passengers to other dimensions, if they can find them.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

Legend says this public grazing area hasn't been plowed for thousands of years.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.