A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A dreamy mausoleum honors Persia's most famous poet.

One of the few surviving street funiculars in the world.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

The modern birthplace of Irish freedom.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

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

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

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

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

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

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

The oldest public library in Ireland.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

The world's oldest bookshop still in operation.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.