For years, the remains of this ancient Roman fortress were hidden under an orchard.

A giant yellow phallus sculpture hidden in the gardens of the Museum Boijmans Van Beuningen.

This monument pays homage to a classic Dutch tune.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

This ghost town in Belgium will lose its street art when it ceases to exist.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

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

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

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

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

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

Some of the saint's blood and bones are said to reside in Dublin.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The house where the writer spent his formative years.

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

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

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

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

The modern birthplace of Irish freedom.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

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

This Neolithic passage tomb forms part of a World Heritage Site.