These banned cigarette vending machines now sell little pieces of pocket-sized art.

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

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

One of the smallest bookstores on the planet.

The best place in the world to buy tinned fish.

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

The world's oldest bookshop still in operation.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A hidden three-foot-wide house separates these two regal churches.

A science fiction-inspired apartment building designed by a famous Spanish architect.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

A temple to modernity, tucked away amid Barcelona's more well known museums.

A fantastic Christmas tradition where defecation meets the manger.

A beautiful but toxic fountain of mercury.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Elvis's own personal tropical hideaway.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

An antiquated German apothecary on Chicago's North Side.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

One man's attempt to create an artistic wonder on a run-down block in Detroit.