This colorful and fiery mural depicts the Irish folk story of the beloved hero Cuchulain.

Though they've since been renamed, these two streets hint at Dublin's darker days.

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

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

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

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

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.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This ancient fortress in Iran was once the oldest and largest treasury in the world.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

The palace of the King of Kings, burned by Alexander the Great.

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

Iran's colorful terraces are a rare geological masterpiece.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

One of the world's largest collections of pathological specimens.

Repository for more than 22 million pickled specimens.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

The remains of Crystal Palace Great Exhibition of 1851.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A mysterious artist-run cabinet of curiosities and library.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

The curios of pharmacist and collector Henry Wellcome.