The largest of London's subterranean rivers and once a mad, bad center of London life.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

There's a piece of New York City transportation history hidden in plain sight at a Manhattan subway stop.

This New York holdover was built to provide housing for shopgirls and still does not allow men above the lobby.

There must be a pun in this haystack somewhere...

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

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

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

A particularly disconcerting tribute to Irish martyrs.

The modern birthplace of Irish freedom.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

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

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

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

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.

The oldest public library in Ireland.

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

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

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

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

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.