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

The modern birthplace of Irish freedom.

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

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

One of Ireland's most infamous prisons for rebels including men, women and children.

A marvel of Byzantine engineering under the streets of Istanbul.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Malaysian fireflies create a dazzling display as thousands light up in unison.

Once the private home of China’s most legendary tycoon, getting inside this stunning mansion no longer requires an elite pedigree or acts of daring.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.