A cluttered and astounding collection of antiquities and curiosities.

An abandoned Byzantine fortress and notorious prison.

360° views of the city plus five floors of optical illusions and hands-on science.

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

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

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Elaborate tile work in this railway station tells the story of Portugal.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Eighty million natural history specimens call this gargantuan museum home.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

An eerie, derelict amusement park in Berlin.

Romania's triumphal arch looks out over Bucharest.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.