This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

One of the last realized projects of an influential, self-taught, French Modernist architect Jacques Couëlle.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

France's Lilliputian park displays over 100 of the country's monuments for visitor perusal.

A total of 22 tiny bridges cross this canal of the Yvette River, forming a unique trail.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

An unusual sand beach in the middle of a forest.

Ghosts of France's colonial past.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

An ethereal glowing blue ocean cave in Croatia.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.