These steps offer a breathtaking view of one of Europe's most besieged fortresses.

The most loyal of little dogs, or a Victorian era publicity stunt?

Fantastic stainless steel dragon gates complete with mesh wings.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large part in Dublin.

After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

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

Catacombs turned marketplace.

This 1920s Dutch barge is now a floating bookstore.

Black cat statues guard this temple-like Egyptian revival factory.

A diverse collection of wax, bone, papier-maché and mummified relics.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

London's smallest police station is barely the size of a phone booth.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

Eighty million natural history specimens call this gargantuan museum home.

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

The "Little Ones," show Portugal in full miniature splendor.

This castle has links to Portugal’s founding and struggles for independence.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

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

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

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