This semi-secret storybook hedge maze is also the oldest garden in the city.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The plague quarantine island home to the alleged "Vampire of Venice."

Venice's "Island of the Mad."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A medieval weapon rumored to have been used by the brilliant poet himself.

Museum dedicated to the terror regimes of Hungary.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This house's itty bitty size means no humans allowed.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A curious collection dedicated to human and animal anatomy and pathology.

Museum preserving torture methods from the past.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

Ever hear of the Milazzo Cage?

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.