One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

An eerie collection of the surviving structures from a past celebration of the future.

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

This elaborately decorated wall is an homage to the history, beauty and lore of the palm tree.

A dictator's failed public works project has been reborn as two linked trails through spectacular scenery.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

The deserted remains of a luxury hotel turned hospital ward.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

An unsettling painting of three faceless sisters that is surrounded by history and legend.

This collection of lurid religious statues tell the tales of a saint who stood down the devil.

A garden of flying flowers.

A moving memorial to the fallen and missing from WWI trenches.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

The largest flower auction house in the world.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

The place where houses are born.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

A true Valhalla for cactus and succulent lovers.