A charming Spanish village sits atop this natural limestone overpass.

Mysterious Spanish catacombs of unknown origins.

A Spanish town built into the cliffs.

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

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A Spanish forest is filled with mysterious stone carvings.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A lush indoor jungle fills this bustling Madrid transportation hub.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Bacteria and algae give the salty water its bubblegum hue.

Week-long block party becomes a competition for the best decorated street.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

An ancient Egyptian temple in the middle of Madrid, Spain.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

This stop on the Camino de Santiago stands high above the underwater ruins of a medieval town.

The mysterious remains of a martyred teenage saint are venerated inside a small country chapel.

This small Estonian hill is covered in hand-made twig crosses that are said to bring good luck.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

The rogue roots are gradually consuming some of the historic marble grave markers.